When a massive explosion at a top-secret prison known as the Pit allows notorious serial killer Richard Harris to escape, disgraced FBI agent Bex Henderson is called back into action to hunt him down before he kills again.

In rural Montana, the team hunts down Lowe, a brutal serial killer obsessed with wolves. Bex and the team must track Lowe through the wilderness while dealing with local Rangers.

When Bex and the team race to stop Roy Barber, known as the Couples Killer, before he strikes again, they uncover a chilling scheme that puts Roy's crimes in an entirely new light.

Bex and the team race to catch Mark Marsden, known as the Widower, a handsome and charming serial killer who murdered three of his wives in cold blood. Everything changes when Mark decides to take a new bride.

Bex and the team hunt their most depraved serial killer yet, Tom Beecher, who seeks pleasure in other people's pain.