Months after a brutal tragedy, young Jake and his mother travel to St. Louis to visit their estranged family during the holidays. Soon, Jake, his cousin Baby Al, and their Bosnian friend Sara must fight for their very lives when they discover the truth about the city's devastating secret past.
As the midnight mass grows nearer, Jake's otherworldly symptoms worsen while Kayla and Deacon Shaw find themselves trapped in the church's catacombs with the restless spirits of Christmases past. Meanwhile, Sara and Baby Al fight the winter storm as their circle of trust becomes increasingly smaller.