Shawn and Gus recount their adventure in London through a "Guy Ritchie" style Voiceover. We learn that Gus is in London for a Harry Potter convention called "Pottercon" and that Shawn has been summoned by Interpol to help on an undercover sting.
Thanks to his police officer father's efforts, Shawn Spencer spent his childhood developing a keen eye for detail (and a lasting dislike of his dad). Years later, Shawn's frequent tips to the police lead to him being falsely accused of a crime he solved. Now, Shawn has no choice but to use his abilities to perpetuate his cover story: psychic crime-solving powers, all the while dragging his best friend, his dad, and the police along for the ride.
Shawn, Gus and Juliet handle one last case in the series finale.
Gus ha estado sufriendo terribles pesadillas, así que va a terapia de sueño para aliviar su problema. Pero las pesadillas de Gus empiezan a parecer demasiado reales cuando él y Shawn aceptan un extraño caso para la policía de Santa Bárbara. Durante el caso, Gus sueña que se enfrenta a zombies y otros monstruos clásicos, y todo mientras intenta asimilar todos los cambios que le depara su futuro.
Shawn is ecstatic when he discovers he’s finally been invited to a prestigious paranormal convention for police consultants. As the main event begins, the leader collapses on stage, and it is clear he has been murdered. All of the police consultants on the panel jump to solve the murder, and everyone’s unorthodox crime solving skills are put together to catch the culprit.
Shawn and Gus are bummed to find out the owner of their favorite food truck has been murdered. The two of them go undercover to learn the food truck ropes and find out who the killer is. While working on the case, Marlowe visits them to cure a pregnancy craving and goes into labor at the most inconvenient time.
Lassiter is determined to be appointed Chief of Police, so he sets out to prove himself worthy of the job by solving the murder of the Mayor’s beloved uncle, Archie Baxter, who was killed back in the 60s but the case was never solved. Meanwhile, Juliet receives some news that tests her relationship with Shawn.