After an argument with her grandmother at her Maryland home, sixteen-year-old Ginny Marshall - "born rotten," according to Gram - gets high and runs away. She turns up on the doorstep of Maggie Ryan and Nick O'Connor's Brooklyn brownstone. Her presence in Brooklyn is unsettling, but, more urgently, Ginny is a suspect in a murder investigation back home. Maggie travels undercover to Maryland, where she searches for a killer as threads from the past threaten to unravel both families.