While three of the fiercest warriors in human history—a Viking raider, a ninja in feudal Japan, and a WWII pilot—are killers in their own right, they are merely prey for their new opponent: the ultimate killer of killers.

Perpetual screwup Stevie is running on empty having just escaped from rehab (again). On a quest to repay her debts and reconcile with her estranged, openly gay son Liam before skipping town for good, Stevie winds up in a slew of high-risk predicaments over the course of a few frenzied days.