Lance Limni is Lancelot, a forgotten Soviet sleeper agent from the Cold War era, who killed his patients for decades without remorse. As a psychiatrist, his knowledge of pain and mind games are put to the test when he faces a new victim - FBI profiler Abby Chilton. The mind games begin as Lancelot and Abby face off in her most dangerous mission. Seneca Jenks, Abby's partner at the FBI, recruits an array of specialists from around the world as they search for the missing profiler. Jonas Lange, Abby's boyfriend and Interpol agent, uses his skills to find the clues others miss. The mysterious Rikka Veilleux, the spymaster of Interpol's Special Assignment Team, joins the hunt with contacts no one else can fathom. The enigmatic tracker, Zima Tobola, has the skill to follow the trail left by Lancelot. Jonas hopes Abby can withstand the torture and twisting of her psyche until they can find her. Abby hopes for the same thing.