Washington's guilt over shooting a bystander resurfaces; Hill's vagabond father pays a visit; Belker goes undercover as Santa Claus; and Bates spends the holiday in the hospital.

A veteran cop's daughter is raped; a terrified woman asks Goldblume for help with her vindictive ex-boyfriend; LaRue and Washington search for the rat that bit Chief Daniels; Bates and Coffey answer a call about a survivalist; and Renko gets busted down to a moped and traffic ticket duty.