Juliet asks Shawn and Gus for assistance on her undercover assignment. They're only too glad to help, since it involves sorority sisters. Unfortunately, what's supposed to be an easy case turns out to have ties to their past and may endanger Juliet.

Meanwhile, Lassiter locks horns with the oldest rookie the departments has ever trained.

Shawn and Gus go undercover as talent show contestants to investigate a number of failed attempts to kill one of the judges.

Shawn and Gus investigate a department store Santa who they suspect is up to no good. Meanwhile, Gus' sister flies in for Christmas.