Henry bails on his weekend outing with Shawn, stating that he's too ill to leave the house. Shawn is nowhere near upset until he and Gus catch Henry driving by, clearly not sick at all. Naturally, they follow him and discover he used to be a member of the Monarch Lodge, a clandestine society. They barge inside looking for an explanation and are surprised to find one of the Lodge members lying dead before them. Shawn suspects murder, and in order to conduct an inside investigation, he becomes a member of the society.

A surveillance tape from the latest robbery in a string of break-ins leads Shawn to believe that women are the culprits. He futher narrows the suspects down to a local roller derby team and suggests that in order to pinpoint the people responsible, Juliet needs to go undercover as a member of their team. Though it's technically her investigation, Shawn can't help getting involved in the case.

Shawn and Gus must prove Lassiter's innocence when he's on the hook for a murder inside of the Santa Barbara Police Department.

In 2003, Juliet made a pact with her boyfriend Scott Seaver to meet up in seven years. After he fails to show up, Shawn finds him, and by extension endangers his life since he was a key witness against mobster JT Waring, who was convicted for the murder of a US Marshall. When Waring denies killing the Marshall, Shawn must prove him right in order to protect Scott.

After Lassiter takes a page out of Shawn's book and claims a shark attack victim was actually murdered, the guys must then scramble to find the fish and prove him right.

When a member of a gang of car thieves turns up dead, Shawn and Gus must infiltrate a drag racing ring to find the killer. Shawn soon finds himself enjoying the fast lane too much, which not only endangers the investigation but also their lives.

While on the haunted house ride at Santa Barbara's Scare Fest, Shawn and Gus witness a murder and are soon led to believe the person who committed it is the ghost of a man who fell to his death at Scare Fest 13 years ago.

After a woman tells the SBPD she witnessed a murder happen in broad daylight, Shawn and Gus are the only ones who believe her, and therefore protect her by hiding her at a remote commune called Box Canyon Ranch, a place whose inhabitants label themselves as progressive intellectuals.

Lassiter hires Shawn and Gus to get to the bottom of strange occurrences at his new condo.

After the Mayor dies in what appears to be a surfing accident, Shawn investigates and ends up running for mayor himself.

After a woman dies from what appears to be a plastic surgery mishap, Shawn and Gus believe the killer is her doctor, a woman who happens to be an old flame of Henry's.

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.