After enduring years of abuse behind the perfect facade of her engagement, Ali Matthews finally snaps and kills her fiancé, Finley, in an act of desperate self-defence. With the help of her impulsive best friend Quinn, she attempts to cover up the crime.

But when a local drug dealer threatens to expose them, their careful plan spirals into a night of escalating violence. As bodies pile up and their friendship is tested to its limits, Ali must confront the darkness she's capable of.