 Only this time, they are forced to use Mr. Yang's knowledge of Yin to solve the case by allowing her to accompany them on the investigation.A young woman, Allison Cowley (Mena Suvari), comes into the Santa Barbara, California police station claiming to have just escaped after being kidnapped and held by the notorious serial killer Mr. Yin.Shawn Spencer and the police are wary to believe Allison, as several others come into the station making similar claims involving the Yin case.