Shawn Spencer cooperates with his old friend, Burton Guster, after being attacked on their vacation.
Police Chief Lassiter is ambushed and left for dead, after which Shawn and Gus leave San Francisco to help him, only to find themselves unwelcome in Santa Barbara as they contemplate a scheme to unravel a case about the supernatural.
While Lassiter reconsiders his career path, Shawn and Groomzilla Gus go wild in an effort to find Selene's divorced husband in time for the wedding before the birth of Baby Guster.