Kelley Quinn is the owner of Nantucket's Winter Street Inn and the proud father of four – Patrick, Kevin, Ava and Bart, all of them grown and living in varying states of disarray. As Christmas approaches, Kelley is looking forward to getting the family together for some quality time at the inn. But when he walks in on his wife Mitzi kissing Santa Claus – or the guy who's playing Santa at the inn's annual party – utter chaos descends. With the three older children each reeling in their own dramas and Bart (a Marine) unreachable in Afghanistan, it might be up to Kelley's ex-wife to save Christmas at the Winter Street Inn.