When Freddy, a troubled young woman, is nearly assaulted outside a nightclub, the toilet attendant steps in to help. Baba, a former child soldier, acts with swift, unstoppable brutality. She's entranced. The pair form an instant intoxicating connection. Something dark within both of them quickly emerges. Soon they set about exacting revenge on people from Freddy's past - Baba's skill for violence and Freddy's tinge of psychopathy prove a lethal combination. But they're not the only ones on the hunt. Can dysfunctional detectives DI Mendy and DS Franks set aside their opposing views long enough to catch the deadly duo?