Vick calls Shawn and Gus in after a group of fast moving and highly organized thieves pull a smash and grab robbery at a department store. It is the third such hit in a month and the cops have no leads. Gus is a little distracted. He's studying for his pharmaceutical rep recertification exam and is annoyed when some green goo from the store ends up on his study guide. As soon as Shawn takes a look at the security tapes, he knows immediately that the perpetrators were women. On the way out of the store, he sees skid marks across the floor and puts it together - the thieves are roller derby athletes.

Eight-year-old Brittany comes into the Psych office in desperate need of help. She wants to hire Shawn and Gus to get Santa out of jail. She saw him being arrested at the mall and they need to get him out by Christmas Eve so he can deliver all the presents. She is so distraught that they agree to look into it as soon as they stop by the Gusters' to see Gus' big sister Joy, who has come home for the holidays. Gus is excited to see her but Shawn's feelings are mixed. He and Joy had a secret one-time fling and he doesn't want history to repeat itself behind his best friend's back. But Joy would love to pick things up where they left off and so jumps at Gus' offer for her to tag along on their Santa investigation.