Shawn is asked by a woman he went to grade school with to help her father, a former police captain, find who murdered someone... as he's not able to remember either the perpetrator or the victim.
When naked men keep turning up in the same field, Gus is sent on a sacrifice date to gather clues, and Shawn learns more about his dad than he ever wanted.
Shawn and Gus horn their way onto murder case as consultants, which includes propping up the lead attorney and somehow proving the client didn't commit the crime.
Shawn manages to get assigned to missing tennis player's case, but his observations don't seem to be leading anywhere and he's forced to ask for help from an unlikely source.
Shawn worries he may be losing his meal ticket when Lassiter goes on a winning streak, solving nine cases in a row, so he horns in on the current case...jeopardizing his and Gus' credibility when he claims a T-Rex killed the victim.
Jockey Jimmy Nickels, a bully who went to school with Shawn and Gus, hires them to find out why his horses keep losing. Things become complicated when another jockey dies in the midst of a race.
Shawn and Gus investigate who poisoned a food critic. Gus's uncle Burton comes to town and tags along on the investigation, so Gus pretends to be psychic.
Two students claim that one of their teachers is a murderer after hearing a phone call. It is Juliet and Lassiter's one year anniversary as partners and Juliet takes her first lead detective job.
Juliet asks Shawn and Gus for help in capturing an accused murderer who escaped from her. They track the man down, but soon discover he is innocent and they try to find the real killer--but things are complicated by a bounty hunter.