Shawn, Gus and Juliet have relocated to San Francisco. After Juliet's partner Sam is shot, the Psych team attempts to find out who did it and why. Additionally, while a mysterious organization is blackmailing Juliet (by insinuating she has done something illegal), Shawn refuses to get married until he can locate his grandmother's stolen engagement ring, Chief Vick's daughter Iris has fallen in with a bad crowd, and Gus is being pursued by an attractive woman who uses all the best moves in his own playbook.