NYPD Detective Ellie Hatcher believes the group of privileged men last seen plying Chelsea with free-flowing alcohol most likely includes a murderer. But after building a tight case against a young hedge-fund manager, Ellie has her doubts, because Chelsea’s slaying is eerily similar to three other murders from nearly a decade ago. Continuing the investigation long after the department brass is satisfied with their case, hard-headed Ellie plunges into a late-night party world of conspicuous wealth and hedonistic consumption to catch the real killer–unaware that a psychopath is watching her every move…and eager to kill again.