A young woman named Allison comes into the police station claiming to have just escaped after being kidnapped and held by the notorious serial killer, Yin. Shawn and the police are loath to believe her since crackpots have been coming into the station for months making similar claims. Yet Allison proves she telling the truth by showing Shawn the picture of himself as a child standing next to Yang that we saw at the end of last season. With the cops on board, Allison takes everyone back to where she claims she was held only to find the house occupied by an innocent family. Shawn still believes her though, and puts her up in Henry's house while they investigate further. The crime lab determines the picture to be real but the background is fake. This could have been taken anywhere.