ATF Agent Jack Donovan has two ambitions in life: take down cult leader Alex Gunderson after years of violent mayhem, and reconnect with his daughter Jessie, who has somehow managed to slip from his life. Unfortunately for Jack, none of his experience as a stellar cop or an absent father has prepared him for the unthinkable way these two parts of his life are about to collide.

In a desperate act of revenge, Gunderson kidnaps Jessie and buries her alive. But just as Jack's team is closing in, Gunderson is shot dead and the secret to Jessie's location is lost with him. With only a few precious hours of oxygen to sustain her, and with not a single clue pointing in her direction, Jessie is sure to die unless Jack can somehow find her. Armed with a father's love and a newfound understanding of the power of family, Jack would trade anything at all to save his little girl - even his own life.