On the 20th anniversary of the brutal Christmas Eve murders at St. Agnes Church, a demonic preacher from the past returns to haunt the townspeople. Among them is Salem, a young man whose once happy life is torn apart when he is forced to commit an unspeakable crime. The only one who believes in his innocence is the heartbroken caller (Alexis Knapp), who is having his own nightmares. Together and apart, they have to face their own demons as well as their real demon, called Mr. Monday.