May, a young Canadian woman with a horrifying past travels to the small highly spiritual town to take her vows into nun hood. There she begins to have premonitions of varies murders that seem to be related to the paintings of Caravaggio. When the inexplicable murders begin, May is plagued by merciless dreams and a tortured ghost that haunts her waking hours. In an escalation of terror and madness, she discovers an obscure secret that digs deep into the history of the town.