An FBI profiler is called to Montreal to assist in a troubling case involving a serial killer who has eluded capture for years. The killer possesses a chilling modus operandi: after murdering his victims, he assumes their identities, living as them for extended periods before killing again. The case is especially challenging because each murder scene leaves minimal evidence, and the killer's ability to completely immerse himself in the lives of the people he kills makes him nearly untraceable. The profiler's unique skills in understanding the minds of criminals are put to the test as she delves into the psychology of a murderer who is always one step ahead.

As the investigation unfolds, the profiler works closely with local police and an art dealer who becomes deeply involved in the case after witnessing one of the crimes. The art dealer's connection to the case proves to be more significant as they uncover disturbing evidence and patterns that suggest the killer is not only changing identities but is also taunting the authorities with each new persona he adopts. The partnership between the profiler and the art dealer develops into a tight bond as they navigate the dangerous twists and turns of the chase, uncovering secrets that draw them closer to the killer. The intensity of the investigation leads them through a maze of deception and disguise, pushing the limits of their professional skills and emotional resilience.