Beth Montgomery seems to have the perfect life. So it doesn't occur to her to worry when the news breaks of a quadruple homicide across town, a botched drug deal that leaves an undercover officer among the dead. Beth certainly would never think to tie the murders to the sudden reappearance in her life of wild, sexy Cassie Ogilvy, the estranged best friend she hasn't seen since they were college roommates. As Cassie confidently settles into Beth's new life, it becomes increasingly clear that her old friend has a lot to hide. But it isn't until a shocking late-night phone call, and Cassie's even more startling disappearance, that Beth begins to understand that her world, as she knew it, is gone forever.