It's 1969. The marijuana is cheap, the girls are wearing short skirts, and the booze is flowing from every direction. Meet Eleanor and Paul Rigby, a swinging couple whose marriage is on the skids. Not to be derailed by their ailing love, the hapless duo decides that this year, they'll host the annual office Christmas party at their house. Hilarity ensues as Eleanor and Paul grasp to the idea of the Christmas Spirit, inviting all to celebrate including their frequent swing partners, along with anyone else who will come. The evening quickly turns into one of boozing, drugs and key exchanges. By the end of the night, things erupt with couples switching off and drunkenly making mistakes of the literal and figurative kind. What will happen at the end of the evening? Will the Rigby's fall in love all over again or will wild lust take over?