Detective Reed Mattox, just three months removed from the death of his partner, has turned invisibility into an art form. Switching to the K-9, taking over the graveyard shift, moving to a farmhouse miles outside of Columbus - his every move has become predicated on putting as much distance between himself and the outside world as possible. That distance is shattered, though, when bodies begin turning up in The Bottoms, the poverty-stricken section of town he is assigned to patrol.

After losing her military K-9, former marine Maya Thompson swears she’ll never work with dogs again. But when she returns home to Colorado and accepts a job with US Forest Service law enforcement, fate brings K-9 Juniper into her life just as another tragedy unfolds.

Wounded in the line of duty, former K9 Handler Maddie Castle finds herself back to square one. The bullet that shredded her leg took the life of her four-legged partner. The pain of recovery goes well beyond the daily physical torment she endures.

Call it a premonition. Call it intuition. Call it anything you like, but Pennsylvania State Trooper Jerry McNeal simply thinks of it as “that feeling.” That feeling may come on without warning, so intense he can’t breathe.

Tom Rollins has gone AWOL from his CIA black-ops unit and is living off-grid when he hears that the woman he loves, Alejandra, has been murdered by a person or persons unknown. Rollins is determined to punish her killers and sets out on his own personal search and destroy mission. Applying pressure as only he knows how, he quickly discovers who was behind the killing—a vicious gang of hardened criminals. Using his dizzying array of lethal skills, Rollins begins to take out the leaders of the gang, one by one.