They need to find this shark now more than ever, and Dr. Phenix gives them insight on where to look for it. But the mayor has upped the reward money and now even more people will be on the trail. Lassiter goes to the marina to warn the fisherman about destroying evidence. Juliet finds him there and tells him they've figured out the victim is most likely Dante Pavan, a web millionaire from Seattle who came down a few days ago. His car is in the parking lot there at the marina. Inside, they find evidence that Pavan was an activist who has a habit of pulling crazy stunts for his causes. Lassiter thinks he was probably in the middle of one when the shark attacked but Shawn is still on murder, pointing out that someone gutted Henry's shark looking for something. He convinces a fisherman, Tanner, that he can psychically find the shark, and Tanner agrees to take him and Gus out on his boat. Out on the water, Shawn uses what he learned from Dr. Phenix, to psychically guide Tanner in the right direction.
Meanwhile, Lassiter and Juliet sort through more of Pavan's things at the police station, where they find evidence that Pavan was targeting local fisherman for their illegal fishing practices. They just need to figure out who Pavan targeted first. Back on Tanner's boat, Shawn finds stacks of notices from the fishing board and a set of shark-toothed knives, with one missing. Tanner is the killer, and he has just hooked the shark they are looking for, with the murder weapon in his gut. Shawn sees a wound on Tanner's arm and puts it all together. Tanner killed Pavan and tried to dispose of the body by tying it to his boat and chumming for sharks. But a shark took a bite out of Tanner, too, taking the murder weapon he had in his hand with him. Tanner wants to destroy the shark and the evidence, so Shawn quickly cuts the line, freeing the shark, while Gus knocks out Tanner before he kills them, too.