Shawn's mom, Madeleine, is in town to do psych evaluations for the SBPD. During her return, Shawn is confused and disturbed by his father's friendly behavior toward her. As if things aren't bad enough, Gus is forced to stop working at the Psych agency when his boss notices that it is interfering with his work at the pharmaceutical company. He demands that Gus quit, lest he be terminated from his real job. However, the company boss has one more case for Shawn and Gus—figure out who's haunting his house and get rid of whatever it is.