Chief Vick calls Shawn and Gus down to the station after a handful of old convictions get overturned. They have to reopen the all the investigations and need Shawn's help on one in particular - Eugene Franks, who was caught with explosives meant to bomb police headquarters. It was the biggest case of Henry's career but Vick stresses that he can in no way be involved in the investigation. Henry's no longer on the force and could compromise any new evidence they find. But by the time Shawn and Gus get back to the Psych office, Henry is there waiting for them and wants in. Shawn refuses.
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. Shawn finds him crouched by the coffee table in the living room. The guys are elated to see him but Henry is less than thrilled. Where they have always been enamored by Jack's wanderlust and fantastic stories of his worldwide adventures, Henry has always known his younger brother to be unreliable and irresponsible. Jack always wants something, and when Henry questions his motives for being back, he confesses that he wants their help to find the
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, convinced someone tried to kill him, thinks the culprit will try again. He and Gus head backstage, where they express their fears to Louis, Dutch's son, who tells them something similar happened on his father's last two stunts. He'd love to hire a psychic detective to get to the bottom of things but money is tight for the family right now. After Shaw
Gus is in charge of his and Shawn's high school reunion and he wants the night to go perfectly. He warns Shawn not to mess things up, then instructs him to go find more folding chairs. While Shawn heads to the cafeteria with Abigail, his high school crush, he sees, out the window behind her, someone fall to their death from the roof. But by the time they grab Gus and head outside, there is no sign of a body. Gus and Abigail don't believe anything happened, but Shawn claims the victim was wearing a letterman's jacket and, after they walk away, he spots part of a lapel pin in the grass.
Shawn's mother Madeleine is back in town to conduct psych evaluations for the police department, and the way she and Henry easily fell back into old habits has Shawn out of sorts. Unfortunately Gus can't offer moral support because he has his own trouble at work. His supervisor, Ogletree found out Gus has been moonlighting at the Psych agency, which not only is against the rules of the exclusivity contract he has with Central Coast, it also has been eating into company time. Ogletree gives him an ultimatum. He either quits the Psych agency or he's fired.
A man is chumming the waters off of a boat at night, when a shark jumps out and latches onto his arm, dragging him into the sea. The next morning, Lassiter and Juliet are at the beach where the body of what appears to be a shark attack victim has washed ashore. Lassiter thinks he sees what might be a knife wound among the shark bites. He sees Shawn and Gus approach, and, determined not to be outdone this time, beats Shawn to the punch, claiming to the press that the victim was murdered.
Shawn is wrapping up a case at a pizza parlor, breaking it down for Vick, Lassiter and Juliet in front of the suspects and a room full of witnesses, when Henry rushes in and quietly tells Shawn he's got the wrong guy. Shawn realizes Henry is right, and must switch suspects mid-stream. Vick overhears Henry talking to Shawn about how much his son comes to him for advice, but she's not the only one there interested in Shawn.
Donny Lieberman, a courier for service that caters to biomedical companies, comes to Shawn and Gus for help. He got very drunk the night before and when he woke up this morning, a cooler he was transporting for GenuTech was missing. It contained the deadly Thornburg virus, whose symptoms include headache, weakness, and bleeding from the eyes. He also says he is missing an antique gold watch. At that same time, a blonde woman stumbles around a convenience store, then starts bleeding from the eyes before she falls down dead.
Juliet goes to the train station to meet Scott Seaver, her college boyfriend. They had planned to meet there exactly seven years after they said goodbye, but he never shows up. At first dejected, she quickly becomes curious as to why he didn't show. She starts to use police resources to track him down, but Vick puts a stop to that before she can find anything. She sees Gus in the station, and asks for his help - but he must keep Shawn out of it. With everything that's happened between them, it would be weird.
Gus has a secret girlfriend that he has been keeping from Shawn but is finally ready to introduce him to Ruby. Shawn’s first impression of her is a good one, but he insists on meeting her friends to vet her further. So he forces Gus to crash what he thinks is a picnic with Ruby and her friends Jessica, Derek and Stu. But the guys soon learn they have walked into a river-rafting trip instead. Ruby is thrown at first, saying there is not enough room, but then relents and hooks them up with gear.