The vow

"Two weeks before her wedding, a stranger stops Amy in the street and warns her she's in danger. Then that night, Matt, her fiancé, doesn't come home. Desperate, Amy calls the police - but when Matt fails to emerge, she's forced to call off her wedding day. Then another man is reported missing, by a woman called Fiona - a man meeting Matt's description, who was about to leave his fiancé for her. He was supposed to be moving in with her - but in...