Dive into the world of Maddie Castle, a retired K9 handler turned private investigator, in this heart-pounding collection of the first three novels in the bestselling series. From gripping mysteries to life-threatening pursuits, Maddie and her canine partners battle danger, corruption, and their own pasts to bring justice to those who need it most.

This collection includes Chasing Justice, Hunting the Truth, and Killer Secrets.

After their last deployment, when she got shot, her fiancé, Martinez, got killed, and his bomb-sniffing dog, Elvis, got depressed, soldier Mercy Carr and Elvis were both sent home, her late lover’s last words ringing in her ears: “Take care of my partner.” On the Fourth of July weekend, when all of Northshire celebrates with fun and frolic and fireworks, the dog alerts to explosives and they find a squalling baby abandoned near a shallow grave filled with what appear to be human bones.

John Dempsey's life - as an elite Tier One Navy SEAL named Jack Kemper - is over. A devastating terrorist action catapults him from a world of moral certainty and decisive orders into the shadowy realm of espionage, where ambiguity is the only rule. His new mission: hunt down those responsible for the greatest tragedy in the history of the US Special Ops and bring them to justice.

While hiking in the foothills of the Rocky Mountains, FBI Special Agent Kendra Dean and her K9 partner, Baxter, stumble upon a dead body stashed in the woods. The discovery changes both of their lives forever. Special Agent Rick Sanchez hunts a serial murderer who is targeting women on a multi-state killing spree. Kendra Dean, an agent Rick met on a joint mission six months ago, has found the most recent victim. Rick and Kendra once shared a tempting chemistry but time and miles made their spark a distant memory.

Mason "Mace" Reid lives on the outskirts of Chicago and specializes in human-remains detection. He trains dogs to hunt for the dead. Reid’s coming off a taxing year - mourning the death of a beloved springer spaniel as well as the dissolution of his marriage. He adopts a rescue dog with a mysterious past - a golden retriever named Vira. And when Reid begins training Vira as a cadaver dog, he comes to realize just how special the newest addition to his family truly is....

Caitlyn Reed and her dog, Renegade, are thrown into the midst of murder and intrigue when they discover a dead body while on a trail ride in the black hills of Wyoming. The local sheriff is hell-bent on a conviction, and Caitlyn’s brother, Dylan, is in his crosshairs. Desperate to prove his innocence, Caitlyn turns to Deputy Colt Branson for help, but she must grapple with their rocky romantic past to gain his aid. As Caitlyn and Renegade pursue the killer, the investigation catapults their lives in a dangerous new direction.

A young woman is found brutally murdered, and the main suspect is the victim's fiancé, a hideously scarred Iraq War vet known as the Burned Man. But railroad police Special Agent Sydney Rose Parnell, brought in by the Denver Major Crimes unit to help investigate, can't shake the feeling that larger forces are behind this apparent crime of passion. In the depths of an icy winter, Parnell and her K9 partner, Clyde - both haunted by their time in Iraq - descend into the world of a savage gang of rail riders.

When a young girl is found dead in the mountains outside Timber Creek, lifelong resident Officer Mattie Cobb and her partner, K-9 police dog Robo, are assigned to the case that has rocked the small Colorado town. With the help of Cole Walker, a local veterinarian and single father, Mattie and Robo must track down the truth before it claims another victim. But the more Mattie investigates, the more she realizes how many secrets her town holds. And the key may be Cole's daughter, who knows more than she's saying.

Ex-military policeman Jack Reacher is a drifter. He’s just passing through Margrave, Georgia, and in less than an hour, he’s arrested for murder. Not much of a welcome. All Reacher knows is that he didn’t kill anybody. At least not here. Not lately. But he doesn’t stand a chance of convincing anyone. Not in Margrave, Georgia. Not a chance in hell.

When teenage sisters go missing in the mysterious "Bennington Triangle" of Vermont, an area renowned for its disappearances and strange occurrences over the past 100 years, FBI agent Jack Juarez brings K-9 handler Jamie Flint and her dog Phantom in to assist with the search. When Jack realizes the case shares haunting similarities with the murders of the missing girls' aunts 10 years before, it becomes clear that he and Jamie are dealing with much more than two girls who simply wandered off the beaten path.

When a fellow FBI agent is kidnapped and a protected witness vanishes, Leo Gallagher will stop at nothing to find them both. So when he discovers a link between the case and a single mother in Wyoming, Leo and his trusty K-9 partner rush to question Alicia Duncan. Could she be the key to locating the missing persons?

Recently engaged and deeply ensconced in her third year of surgical residency in Chicago, Emily Hartford gets a shock when she is called home to Freeport, Michigan, the small town she fled a decade ago after the death of her mother. Her estranged father, the local medical examiner, has had a massive heart attack. At the hospital, she finds her father in near total denial of the seriousness of his condition. He insists that the best thing Emily can do to help him is to take on the autopsy of a senator's teen daughter whose sudden, unexplained death has just rocked the sleepy town.

Sent to find a wedding party that disappeared during a hike, Alaska state trooper Hunter McCord and his K-9 partner, Juneau, discover bridesmaid Ariel Potter hanging from a cliff. But this was no accident—she was pushed—and her hiking companions are missing. Now it’s up to Hunter and Juneau to find them…and make sure whoever wants Ariel dead doesn’t finish the job.

As a native of the small town of Hansonville, North Carolina,and a wilderness rescue worker, Raine Stockton knows the Smoky Mountains as well as anyone could, but she gave up her Search and Rescue work after a tragic loss. Now she reluctantly returns to active duty to help find a young child who has been kidnapped and taken deep into the forest.

Former CIA operative turned mercenary for hire Ryan Decker’s specialty is rescuing kidnap victims. Hired by an influential US senator to liberate her daughter from a human-trafficking ring, Decker never anticipated sabotage or that the assault could go so disastrously wrong. The hostage is dead. His team is wiped out, and so are their families, including Decker’s own wife and son - eliminated one by one by the Russian mafia. And he’s survived to take the fall.

When Detective Madison Harper arrives at a remote summer camp in Shadow Falls, Northern California, her heart breaks for Jenny, the sweet little girl last seen splashing in the lake with her friends before she vanished. Peering into the silent cabins filled with rows of neatly made beds, Madison knows this idyllic place is hiding a terrible secret.

Coming from scandalous Florida treasure hunters and drug smugglers, Sloan McPherson is forging her own path, for herself and for her daughter, out from under her family’s shadow. An auxiliary officer for Lauderdale Shores PD, she’s the go-to diver for evidence recovery. Then Sloan finds a fresh kill floating in a canal - a woman whose murky history collides with Sloan’s. Their troubling ties are making Sloan less a potential witness than a suspect. And her colleagues aren’t the only ones following every move she makes. So is the killer.

Former homicide detective Nicole Foster has hit rock bottom. Driven off the force by her treacherous partner and lover, she's flat broke and struggling with a gambling addiction. All Nicole has left is the dream of a warm bed at a homeless shelter and the haunting memories of three-year-old Kelsey Chase—whose murder case ended her career. As Nicole obsesses over the old facts, she realizes everything about that case felt off.

Law professor Thomas Jackson McMurtrie literally wrote the book on evidence in the state of Alabama. But when a power-hungry colleague uses a recent run-in between McMurtrie and headstrong student Rick Drake to end his career, he is left unsure what to do next.

A massive FBI manhunt is underway for an elusive and terrifyingly adept serial bomber. He's just struck his sixth target, Idaho's Boon Dam, killing a dozen innocent people. But the bomber, who the press has dubbed "Green Man", insists these drastic acts of violence - each one carefully selected to destroy a target that threatens the environment - are necessary to draw the world's attention to the climate-change emergency. The FBI has no real leads. Until young Agent Tom Smith approaches the task-force leader with an unexpected insight.

Tragedy has stalked Blake Larsen her entire life. After the violent death of her parents leaves her orphaned, her Green Beret brother Caleb is all she has left. He was there the day she graduated high school and the first person she called after she became a federal agent. Then the cops find him swinging from the rafters. The horrific discovery pushes Blake to the edge of despair. Then one of Caleb's closest friends is violently murdered outside her front door—and the killer snatches a folder from his dying fingers. It's clear Kyle was silenced moments before coming clean

After three decades in counterintelligence, Brad Trasker is retired, disillusioned, and dealing with a tragic loss. Spy games are behind him until he attends the launch of a next-generation aircraft. When the project of innovative aerospace CEO Kylie Connor explodes on the tarmac—nearly killing her in the process—Trasker is pulled back into the line of fire. The mystery of the sabotage quickly deepens.

DI Amy Winter is hoping to follow in the footsteps of her highly respected police officer father. But when a letter arrives from the prison cell of Lillian Grimes, one half of a notorious husband-and-wife serial-killer team, it contains a revelation that will tear her life apart. Responsible for a string of heinous killings decades ago, Lillian is pure evil. A psychopathic murderer. And Amy’s biological mother. Now, she is ready to reveal the location of three of her victims - but only if Amy plays along with her twisted game.

If She Only Knew, introduces the Cahills, a wealthy San Francisco family - rich in money, twisted secrets, and hidden agendas. Now at the center of their tangled world is Marla Cahill - a woman with no memory of who she is, what she’s done, or why she could be the next to die... It begins on a dark stretch of highway. Two vehicles swerve and crash - leaving one woman dead and another in a coma. When the surviving woman awakens, her memory is gone and her face has been reconstructed. Her family tells her that her name is Marla Cahill - but they’re all strangers to her.

PI Charlie Dodge knows what it’s like to have something important disappear. His wife, Annie, suffers from early-onset Alzheimer’s, causing her to remember little of the life she shared with her husband. Charlie has devoted his career to saving what he can - missing people, threatened lives. But when prominent Denver multimillionaire Carter Dunleavy vanishes without a trace, Charlie and his assistant, Wyrick, discover missing doesn’t always mean gone. It turns out Carter didn’t vanish after all - he’s gone into hiding.

A video of Deputy Eve Ronin’s off-duty arrest of an abusive movie star goes viral, turning her into a popular hero at a time when the Los Angeles County Sheriff’s Department is plagued by scandal. The sheriff makes Eve the youngest female homicide detective in the department’s history. Now Eve, with a lot to learn and resented by her colleagues, has to justify her new badge. Her chance comes when she and her soon-to-retire partner are called to the blood-splattered home of a missing mother and her two kids. The horrific carnage screams multiple murder - but there are no corpses.

Former soldier. Ex-copper. Current man on the edge. Shunned by his old colleagues, and dividing his time between a dead-end job and the bottom of a whisky bottle, former Police Scotland detective superintendent Bob Hoon’s life is a mess. Then an old face from Hoon’s Special Forces days turns up asking for help: His teenage daughter has been missing for months, the police have drawn a blank, and he needs the kind of help that only Hoon can provide. And besides, Hoon owes him one.

This is Reaper speaking. So begins an anonymous letter published in a Utah newspaper after a young couple is viciously murdered. Tooele County sheriff Elizabeth Gray leads the investigation into the double homicide, which is eerily reminiscent of a string of brutal killings years ago. When the letter leads detectives to yet another body, Gray calls on an old friend for help.

Christopher Snow is different from all the other residents of Moonlight Bay, different from anyone you’ve ever met. For Christopher Snow has made his peace with a very rare genetic disorder that leaves him dangerously vulnerable to light. His life is filled with the fascinating rituals of one who must embrace the dark. Then he witnesses a series of disturbing incidents that sweep him into a violent mystery only he can solve, a mystery that will force him to rise above all fears and confront the many-layered secrets of Moonlight Bay and its strange inhabitants.