In the summer of 1989, a group of bullied kids band together to destroy a shape-shifting monster, which disguises itself as a clown and preys on the children of Derry, their small Maine town.
A priest with a haunted past and a novice on the threshold of her final vows are sent by the Vatican to investigate the death of a young nun in Romania and confront a malevolent force in the form of a demonic nun.