LOGLINE:
After Shawn and Gus help a little girl get a mall Santa out of jail in time for Christmas, they realize their clients are con men who have a big score planned.  Helping them with their investigation is Gus' sister Joy, in town for the holidays and looking to repeat a one time fling she had with Shawn, who is determined to keep his best friend from ever finding out.

SYNOPSIS:
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.

At the police station, they find out that Santa is being held as part of a fight at the mall that left a man unconscious.  They are keeping all participants in custody until they figure out which one to charge with assault.  Juliet takes the guys down to the holding cell where Shawn quickly sees that their Santa only has defensive wounds, but another suspect is a Krav Maga expert whose hands are registered deadly weapons.  He confesses to hitting the victim but says he only did so to stop him beating up Santa.  Juliet releases Santa, and Shawn and Gus have saved Christmas for little Brittany.  On the way out of the station, Shawn finds out that his apartment is being fumigated.  Since Henry has some old buddies in town, he can't stay there and needs to find a place to crash.  Joy happily offers up the Gusters' house.  Shawn balks but Gus insists.  Before Shawn can protest further, they see little Brittany yelling at “Santa” who, it turns out, is actually her father.  She tells him they only have three days left and not to screw up again.  Shawn and Gus were conned.  Juliet runs Santa's prints and tells them that he is noted con man Carl Wilcox.  Shawn realizes he and Brittany must be planning a job, and they head to Santa's Village to investigate.

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