When young, pretty, successful Lana Ross divorces her indifferent husband of ten years, Cadillac dealer Lucas Chisholm, she randomly chooses a local locksmith to change the locks in her home located in Columbine Point, nestled near the iconic Flatirons of the scenic Rocky Mountains and nearby Boulder, Colorado. The selected locksmith, sinister, grimy, and smoky, Leon Alvarez, unbeknownst to Lana, was a former classmate who had been infatuated with her in high school but forgot about her when she went to college. But her renewed contact with him stirs his old feelings for her into lust and obsession and the demented belief that she will want him. After a series of calculated sinister events occur in her house, Lana asks Leon to set up a security alarm system. He uses the opportunity to place hidden surveillance cameras throughout her house to watch her in her most private moments. But his plans to win her affection are derailed when Lana meets dark and handsome Louisville Harley-Davidso