As Jessica attends a colleague's retirement party at the high school where she once taught, she is stunned when her old friend winds up dead. Something about it is especially troubling—his death has mysterious links to Jessica's very first murder case, when the principal died under mysterious circumstances. With nothing but her instincts to guide her, Jessica embarks on a quest to find out what really happened all those years ago, and she believes that time is running out to catch this killer.