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.

In remote, icy Greenland, ex-Air Force General Steven Macaulay helps lead an expedition to recover a lost World War II plane. Encased in ice below is a find that will astonish the world - a perfectly-preserved Viking ship, buried for nearly a thousand years, along with the frozen corpses of nine crewmen. Assembling the foremost Viking scholars, Macaulay tasks the gorgeous Lexy Vaughan to translate the ship’s markings - until her work is cut short when her colleagues are murdered.

When a sudden crime wave hits several small midwestern towns, the US Attorney for the region calls on Harry Duncan to investigate. An ex-cop known for his unorthodox methods, Duncan is reluctant to go up against a widespread criminal organization—but the attorney in question is Ellen Leicester, the wife who left him fifteen years earlier, and to her, he can't say no.

If you love mysteries with action, suspense and a touch of humor and romance, then the David Wolf series is for you.

Court Gentry is known as The Gray Man—a legend in the covert realm, moving silently from job to job, accomplishing the impossible, and then fading away. And he always hits his target. But there are forces more lethal than Gentry in the world. And in their eyes, Gentry has just outlived his usefulness. Now, he is going to prove that for him, there's no gray area between killing for a living-and killing to stay alive.

Max Rupert has left his position as a Minneapolis homicide detective to live in solitude. Mourning the tragic death of his wife, he's also racked by guilt—he alone knows what happened to her killer. But then the former local sheriff, Lyle Voight, arrives with a desperate plea: Lyle’s daughter Sandy and his six-year-old grandson Pip have disappeared. Lyle’s certain Sandy's ex-husband Reed is behind it, but the new sheriff is refusing to investigate. When Max reluctantly looks into their disappearance, he too becomes convinced something has gone very wrong.

Just days before a massive exhibition opens at the popular New York Museum of Natural History, visitors are being savagely murdered in the museum's dark hallways and secret rooms. Autopsies indicate that the killer cannot be human.... But the museum's directors plan to go ahead with a big bash to celebrate the new exhibition, in spite of the murders.

On his last combat deployment, Lt. Cmdr. James Reece's entire team was killed in an ambush that also claimed the lives of the aircrew sent in to rescue them. But when those dearest to him are murdered on the day of his homecoming, Reece discovers that this was not an act of war by a foreign enemy but a conspiracy that runs to the highest levels of government. Now, with no family and free from the military's command structure, Reece applies the lessons that he's learned in over a decade of constant warfare toward revenge.

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.

The moment Navy SEAL sniper Finn sets foot on the USS Abraham Lincolnto hitch a ride home from the Persian Gulf, it’s clear something is deeply wrong. Leadership is weak. Morale is low. And when crew members start disappearing one by one, what at first seems like a random string of suicides soon reveals something far more sinister: There’s a serial killer on board. Suspicion falls on Finn, the newcomer to the ship. After all, he’s being sent home in disgrace, recalled from the field under the dark cloud of a mission gone horribly wrong.

Billy Summers is a man in a room with a gun. He’s a killer for hire and the best in the business. But he’ll do the job only if the target is a truly bad guy. And now Billy wants out. But first there is one last hit. Billy is among the best snipers in the world, a decorated Iraq war vet, a Houdini when it comes to vanishing after the job is done. So what could possibly go wrong?

For five grand a month and a million-dollar chaser, Roger Mulligan didn't care how crazy the old geezer was. All he had to do was keep Joseph Perry Shackleford alive and keep him from squandering the estate for a year. But they didn't tell him about the pixies.

On the eve of his medical retirement, Navy SEAL Jedidiah Johnson receives a frantic call from his estranged childhood best friend David Yarnell. David’s daughter has been kidnapped off the streets of Nashville in broad daylight. The police have no suspects and no leads. The only clue: the body of a dead priest left behind at the scene. With the clock ticking, David is growing desperate, as is his wife, Rachel . . . Jed’s first love.

When an experiment to study quantum uncertainty goes spectacularly wrong, physics student Bill Rustad and his friends find that they have accidentally created an inter-dimensional portal. They connect to Outland - an alternate Earth with identical geology, but where humans never evolved. The group races to establish control of the portal before the government, the military, or evildoers can take it away. Then everything changes when the Yellowstone supervolcano erupts in an explosion large enough to destroy civilization and kill half the planet.

After Jake Slater’s wife dies in a tragic hit-and-run, all he has left is his daughter, Piper—nearly lost, too, in a brutal custody battle with his wealthy in-laws. A year later, Jake reluctantly agrees to a reunion with the estranged family for Piper’s thirteenth birthday. Then a single gunshot rings out, and a new nightmare begins. Piper is kidnapped, and her cousin Caitlin is murdered. Caitlin’s cryptic dying words: Piper knows the truth.