Mike and Maddie, a young couple with a new baby, are rushing home to prepare for their first family New Year's Eve party. When they arrive, however, they're shocked to find their apartment has been robbed. Even worse, the burglar is still there -- sound asleep on their bed!
But it's New Year's Eve in Chicago, which means that they're on a wait list for the cops and Maddie's anti-Chicago, pro-suburbs family is due to arrive any minute. So Mike and Maddie tie up the burglar, drug him with Nyquil and hide him in their room, hoping to fake their way through the party until midnight.
When Mike's born-again Wiccan grandmother unexpectedly shows up with her new boy-toy husband, things go from weird to wacky. Then, when the cops arrive right before midnight and arrest Mike and Maddie, things go from wacky to worse.
Soon, Mike, Maddie and Maddie's best friend, Rio, are down at the police station, each pleading their view of events, about the New Year's Eve party that none of them will ever forget.