Originally aired on December 13, 2005 on FOX network, the episode is written by Hart Hanson and directed by Greg Yaitanes.
The plot features FBI Special Agent Seeley Booth, Dr. Temperance Brennan and the rest of her team being forced to remain at the Jeffersonian Institute over the Christmas holiday.
Bones and the rest of the team start investigating the dead man's story when Zack triggers the bio-hazard alarm while cutting through the skeleton.
The case, meanwhile, progresses into the discovery of a love affair between the dead man, Lionel Little, who worked as a lease inspector for a company called Silver Cloud Petroleum and had a coin collection, and his black cleaning lady (Ivy Gillespie) in the late 1950s.
We find out that Booth has a 4-year-old son named Parker (because his mother didn’t marry him, his parental rights are vague), and that Billy Gibbons from ZZ Top is Angela's father.
With everyone else in the lab celebrating Christmas with secret Santa gifts, Bones decides to track down Ivy and reveal the lethal mystery behind Lionel's disappearance to her.
Sitting alone on the couch with Angela's holographic Christmas tree and leftover decorations still up, Temperance finally opens her parents' gifts to her and smiles through her tears.
"[2] This setting allowed the writers to expand on the details of the characters' lives and to continue with Brennan's background story, concerning the disappearance of her parents and her experiences in foster care system.
[3] As a lead-in program for House, Bones attracted 7.12 million viewers on December 13, 2005 with episode "The Man in the Fallout Shelter".