Shawn’s mother Madeleine is back in town to conduct psych evaluations for the police department, and the way she can Henry easily fell back into old habits has Shawn out of sorts. Unfortunately, Gus can’t offer moral support because his has his own trouble at work.

Gus has worked long and hard organizing their high school reunion, so when Shawn claims one of their fellow alumni has been murdered and his body has been hidden, Gus refuses to believe him. Shawn must now try to solve a case no one thinks exists before the reunion ends and the attendees escape back to their grown up lives. Cybill Shepherd and Rachael Leigh Cook guest star.

When Shawn and Gus get tickets to a daredevil show as payment for a job, Shawn notices that Dutch "The Clutch" Jenkins’ fuel line has been cut just as his motorcycle flies through a ring of fire. Luckily Dutch survives the stunt, and Shawn, convince that someone tried to kill him, thinks the culprit will try again.

Shawn, Gus and Henry return from a night at the movies to find that Henry’s younger brother Jack is back in town and has broken into the house. Jack always wants something and when Henry questions his motives for being back, he confesses that he wants their help to find the French pirate Bouchard’s hidden treasure.

Chief Vick calls Shawn and Gus to the station after a handful of old convictions get overturned. They have to reopen all the investigations and need Shawn’s help on one in particular-Eugene Franks, who was caught with explosives meant to bomb police headquarters.

After Safety Inspector Butch Hicks falls to his death off an offshore oilrig, Chief Vick enlists Shawn and Gus’ help with the case. As she takes them out to the crime scene on the police boat, she tells them they received an anonymous tip that something highly unsafe was happening on the rig and the caller was risking his life to warn them.

Vick calls Shawn and Gus in after a group of fast moving and highly organized thieves pull a smash and grab at a department store. It is the third such hit in a month and the cops have no leads.

Gus leaves Shawn waiting in the car while he goes inside a bank to make a deposit. He’s only in there a few minutes before a woman spots a gun in the jacket pocket of another customer.

After Shawn and Gus help a little girl get a mall Santa out of jail in time for Christmas, they realize their clients are con men who have a big score planned.

When Shabby the Sea Lion is found dead after being released into the wild, Shawn sets out to prove it was murder and stumbles onto a bigger conspiracy.

There’s a thunderstorm in Santa Barbara that has been causing the electricity to flicker on and off, but that doesn’t stop Lassiter from making the bust of his career.

Arson Inspector Morgan Conrad comes to the police for help investigating a building burned down under what she believes to be suspicious circumstances. Shawn and Gus join up with a local firehouse to prove this fire is part of a series of arsons are more than they seem.

Shawn and Gus go undercover at a professional football training camp when the foot of the team's missing kicker is discovered.

Shawn and Gus are at the police station when the cops bring in Ryan Bainsworth, a notorious compulsive liar, for murder. Ryan has called in countless tips only to lead the cops on wild goose chases. It looks like this time Ryan actually committed a crime himself...

Shawn and Gus are hired by a childhood friend to find missing camp counselor Annie, who disappeared near their old sleep away campgrounds. Upon their arrival, spooky activity abounds and they must uncover if the dark past of the abandoned camp has come back to life.  And, oh yeah, Justine Bateman guest stars as Lassiter's estranged wife Victoria!

The Yin Yang Killer, a serial killer who was active when Henry was a cop then went silent, is back and wants to toy with the department again, this time singling out Shawn as his primary playmate.