Two days before Christmas Angela, who is dressed as an elf, wants everybody to join her for a Chistmas party. Bones seizes her only chance of escape when Booth gives her the kind of present he knows she likes. The present: a 50 year old corpse found in the atomic fallout shelter of a building where Congress lodges guests! When the bones are sawed open, a fungus causing life-threatening valley disease is unknowingly released. Hodgins takes his mask off to drink eggnog and everybody is subsequently quarantined indefinitely. They learns more about each other's personal backgrounds, notably that Booth has a 4 year old son, Parker, but no parental rights and Bones' parents disappeared on Chistmas Eve. Angela is determined to celebrate Christmas even though she's locked-up and exchanges hand-made gifts, with her relatives coming visit her behind glass. Meanwhile the corpse is fairly easily identified as a white-collar white man Lionel, who hoped to get married in Paris to his -illegal- girlfriend Ivy from the proceeds of his valuable coin collection, but was robbed and murdered by the buyer.
—KGF Vissers