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Jake, Charles and Gina find themselves in a real-life "Die Hard" situation on Christmas Eve; and Terry is forced to leave his family celebration in order to save his squad. Meanwhile, Amy tries to prove that she's just as tough as Holt and Rosa.
Capt. Holt and Jake contract the mumps during an investigation and become quarantined together in hopes of solving the case. Meanwhile, Rosa tries to help Boyle through a mourning process; and Terry is forced to clean up Hitchcock and Scully's mess.