June Moody, a thirty-something English professor, just wants to get away from her recent breakup and reunite with girlfriends over summer break. Her old friend and longtime nemesis, Sadie MacTavish, a mega-successful author, invites June and her college friends to a baby shower at her sprawling estate in the San Juan Islands. June is less than thrilled to spend time with Sadie--and her husband, June's former crush--but agrees to go.

The party gets off to a shaky start when old grudges resurface, but when they wake the next morning, they find something worse: Sadie is missing, the house is in shambles, and bloodstains mar the staircase. None of them has any memory of the night before; they wonder if they were drugged. Everyone's a suspect. Since June had a secret rendezvous with Sadie's husband, she has plenty of reason to suspect herself. Apparently, so do the cops.