When K-9 task force officer Zach Kelsey’s estranged wife is attacked at a Mount Rushmore observation deck, he and his K-9, Amber, are quick to come to her rescue. He discovers not only that Eden, a park ranger, is carrying his child, but that she saw her coworker’s murder. As the only witness to the crime, Eden has no choice but to accept Zach’s protection. But with a ruthless killer ramping up his vicious attacks, they must put their differences aside to catch the murderer…before Eden becomes his next target.

Racing into a burning cabin to search for survivors, firefighter Diana Cameron stumbles upon an unconscious child—and two bodies with bullet wounds. When a sniper targets their narrow escape, Diana has no choice but to team up with bodyguard Chase Mitchell to keep the little girl safe. Uncovering the identity of the murder victims is the only way to find the killer. But as they’re chased by gunmen into the mountain wilderness, can they protect a tiny witness from the unknown…when the truth is more sinister than they imagined?

K-9 officer Tarren McGregor never imagined that a cartel would find its way to Texas’s South Padre Island—or target his best friend’s sister. But when Julia Hamilton witnesses and prevents the kidnapping of a teen girl, Tarren knows that trouble is soon to follow. Because Julia didn’t just protect the girl—she saw the abductor’s face. Now she’s marked for murder, and it’s up to Tarren and his K-9 partner to keep Julia safe from the human traffickers in pursuit…even if it means putting themselves in the line of fire.

When patrol officer Trisha McCord's six-month-old son is nearly abducted, K-9 officer West Cole saves him just in time. The single mom has no leads on who would try to take her baby—or why. And West won’t let her deal with the threat on her own, especially with the kidnapper closing in and attacks escalating. With her child’s life at stake, Trisha, West and his K-9, Peanut, must race to catch a ruthless criminal in time to save innocent lives—including their own.

Detective James Holton has been honorably discharged from the Army Criminal Investigation Division due to wounds sustained when an IED blew up near him. Now with the Lake City Police Department, he's rooming with his good buddy and partner, Cole, while he figures out his family dynamics. Physician Assistant Lainie Jackson is eighteen months out from an attempted murder perpetrated by her ex, which ended when she managed to grab the weapon and shoot him. When he appears to have survived and is back to finish the job he started, Lainie insists it's not possible.