Henry's old captain believes he's solved a murder, but his Alzheimer's has caused him to forget the most important details: the crime, and who committed it.

Henry calls in Shawn and Gus who find themselves investigating a murder that happened decades ago and only the faulty memory of the retired officer gives them any hope of closing the case.

Henry's friend refuses to report his son, Brandon, missing after the son steals 30,000 dollars. Shawn agrees to help locate the son, and finds out that Brandon has been involved in some underground poker.

Meanwhile, O'hara tries to surprise Lassiter on his birthday.

Shawn tracks down Lassiter's car with little difficulty after it's stolen. However, Shawn discovers that there's more to the situation than meets the eye and calls Gus back from vacation to help with the investigation.

Eugene Franks, arrested by Henry in 1978 for plotting to bomb the SBPD, is released after his conviction is quashed by the D.A. When Shawn is instructed to solve the case, his father insists on helping him; however, the case is not as clear cut as he once thought.

When a polar bear trainer is found dead, Shawn works to prove the bear's innocence.