A couple meets up with another couple while on vacation in Mexico, but their friendship takes an awkward turn when they get back home.

Ellie, a recovering drug addict, moves to a new city with her two teenage children. Struggling to stay sober, her life changes when she meets Christopher, who is a different kind of addict.

Nothing is what it seems when a twisted one-night stand spirals into a serial killer's vicious murder spree.