Hiding within a group of eight FBI profilers is a serial killer. In the ultimate test of their crime-solving savvy, these endangered young agents--each compelled by his or her secret past to probe the criminal mind--must figure out who among them is a ruthless predator--before, one by one, they all fall prey to the killer's ingenious plan. When a simulated FBI training exercise turns shockingly real, with one of the agents meeting an unexpected demise, the profilers realize this is more than a final exam--it's a battle for their lives. Completely isolated, the agents have no choice but to solve the heinous crime on their own. But how can they trust one another when they each possess the skills, the motives and the means to be the murderer? No one is above suspicion, or the perils of overwhelming fear, as they use everything in their power to uncover the killer's identity and end the relentless hunt.