Shawn's exploits have garnered him fame, if not fortune. Unfortunately, they've also brought him to the attention of the Yin Yang serial killer, and Shawn's mother is his next target.

Shawn and Gus are asked by a childhood friend, Jason Cunningham, to investigate the disappearance of his camp's counsellor.

Gus and Shawn's client, a pathological liar, has information about a planned assassination. The problem is getting anyone at the SBPD to believe him.

Shawn and Gus investigate the death of a footballer named Vlad.

Partnered with an arson inspector named Morgan, Shawn and Gus attempt to bring an arsonist to justice before he or she can strike again.

A desperate Lassiter turns to Shawn and Gus for help when he's implicated in a murder at the police station.

Shawn, sure that the death of Shabby the Sea Lion is murder, finds himself in deeper water after he stumbles upon a plot that involves much more than rehabilitating a mammal back to the wild.

Shawn and Gus investigate a department store Santa who they suspect is up to no good. Meanwhile, Gus' sister flies in for Christmas.

Gus is taken hostage at the Santa Barbara Savings and Loan Bank while making a deposit for Shawn.

Juliet goes undercover as a skater to solve a number of robberies that are linked to a roller derby team.

Shawn and Gus investigate the death of a safety inspector aboard an offshore oil rig. The investigation is complicated by the commander of the coast guard, Barbara Dunlap, Chief Vick's sister.

Eugene Franks—arrested by Henry in 1978 for plotting to bomb the SBPD—is released after his conviction is quashed by the D.A. When Shawn is instructed to solve the case, his father insists on helping him; however, the case is not as clear cut as he once thought.

Henry's brother, Jack, claims that he has a map that leads to buried treasure. Shawn and Gus assist Jack in his search for the treasure, but it turns out that Jack has a lot more going on than meets the eye.

Shawn suspects foul play after Dutch the Clutch, a daredevil, is almost killed while performing a stunt.

Shawn and Gus attend their high school reunion. Shawn sees a body fly past a window, but on further inspection the body has vanished. When Gus assumes the worst, and Lassiter refuses to help, Shawn seeks assistance from Juliet.

Gus' supervisor, Frankjim Ogletree, demands that he quit moonlighting at Psych, lest he face termination. The vice-president of Gus' pharmaceutical company, however, decides to hire the duo as his wife believes that their home is haunted.