On Christmas Eve, a group of mercenaries breaks into the wealthy Lightstone family’s compound, taking everyone hostage. The ruthless leader, Scrooge, has orchestrated the heist knowing the patriarch has recently passed away and believing the family will be an easy target. His team of skilled ex-military operatives intends to force the matriarch of the family, Gertrude Lightstone, to open the estate's impenetrable vault filled with millions in cash. As the situation escalates, the family's dysfunction and internal conflicts become evident, with the estranged daughter Trudy and her child being key to surviving the night.

Unbeknownst to the criminals, an unexpected guest is also on the property. Santa Claus is in the midst of his Christmas rounds when he becomes entangled in the home invasion. Initially disenchanted with the greed he witnesses in the modern world, Santa finds himself drawn into the conflict. With a unique set of skills and intimate knowledge of the house, as he has visited it for many years, Santa takes on the role of protector. As he stealthily maneuvers through the estate, he begins to dispatch the mercenaries using his magical abilities and a variety of improvised weapons, proving to be a formidable opponent while he attempts to save the Lightstones from a grim fate.