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So I Married an Axe Murderer

Charlie MacKenzie is a popular local beat poet living in San Francisco who makes his frequent break-ups the subject of his poems. His best friend Tony, a recently promoted police detective, believes that Charlie is afraid of commitment and will identify (or invent) any reason to break up with someone.

While purchasing Haggis for his Scottish-born parents, Stuart and May, he encounters a butcher named Harriet, and is attracted to her. During his visit with his family, Charlie and May discuss his most recent break-up, and May brings up a tabloid article about a bride known as "Mrs. X", who kills her husbands on their honeymoons using an axe.

Charlie goes back to the butcher shop and offers to help Harriet. The two find common bonds and start to date. After staying at her place one night, Charlie meets Harriet's eccentric sister, Rose, who warns Charlie to be careful. He learns Harriet used to live in Atlantic City, was involved with a trainer in Russian martial arts, and screams for someone named Ralph in her sleep. Charlie arranges a dinner with her to meet his parents, who say she is their favourite of all his partners. Charlie reads the article about Mrs. X, which identifies two of her victims as a martial arts expert and a man named Ralph.

Charlie becomes fearful and asks Tony to investigate Harriet and the Mrs. X story. Tony reveals that the husbands of Mrs. X were all reported missing alongside their wives, assuring that Harriet is unlikely to be Mrs. X. Charlie remains on edge, and after a few more troubled dates, breaks up with her. Tony reports that a killer in the Mrs. X story has confessed. Relieved, Charlie apologizes to Harriet by reciting one of his beat poems to her from her rooftop. They make up, and Harriet explains away some of her history, such as Ralph being the name of a woman she knows.

At his parents' wedding anniversary Charlie proposes to Harriet. She accepts after some hesitation. Following the wedding ceremony, they embark on a honeymoon to a secluded mountain hotel. After they depart, Tony learns that the confessed killer is actually a compulsive liar. He sends a photo of Harriet to the known associates of the missing husbands, and all identify her as their friends' wife. With phone lines to the hotel down due to a storm, Tony charters a plane. Once he lands, he calls Charlie locally and warns him that Harriet really is Mrs. X, but the hotel phone line is knocked out and power is lost.

Charlie panics and tries to stay away from Harriet without letting her know what he knows, but the hotel staff force him into the honeymoon suite for their first night together. After locking Harriet in the closet, Charlie discovers a letter, purportedly written by him, explaining his absence to Harriet. Rose appears wielding an axe and reveals herself as the Mrs. X killer. She feels that Harriet's husbands are taking her sister from her, motivating her to kill them on their honeymoon night and leave letters behind claiming to be from them, leading Harriet to believe that each husband abandoned her. Charlie flees from Rose.

Tony leads the police into the hotel and arrests Harriet, still believing her to be the murderer. Charlie, having been chased to the hotel roof by Rose, gets Tony's attention as they take Harriet away. While the police make their way up to the roof, Rose swings the axe at Charlie and is thrown off the building. Tony catches her, and she is arrested and taken away. Charlie and Harriet resume their lives as a happy couple.