Suburban couple Caitlin and Miguel hire the seemingly sweet Polly to take care of their newborn baby. But Polly's true motives have little to do with singing lullabies.

When Kit mysteriously disappears after a night of partying, her friends are left to piece together the events of the evening, only to uncover a betrayal that shakes their relationships to the core, forcing them to confront their own biases and assumptions about who they can trust.