On a hot evening in Cambridge, Massachusetts, Dr. Kay Scarpetta investigates a dead bicyclist who was attacked with almost super human force. Before she’s notified, her FBI agent husband receives a suspicious call, allegedly from Interpol. It becomes apparent that an onslaught of interference and harassment might be the work of the cyberbully Tailend Charlie, who has been sending cryptic communications to Scarpetta. Even her brilliant tech-savvy niece, Lucy, can’t trace whoever it is. When a second death hundreds of miles south shocks Scarpetta to her core, she’s confronted with something far bigger and more dangerous than she’d ever imagined.