The Watcher in the Attic (1976)
A lodger in a run-down 1920s boarding house stumbles upon the landlady committing a shocking crime. Instead of being repelled, he becomes consumed with a twisted obsession for her. Believing that murder is the ultimate proof of devotion, he devises a plan to eliminate a fellow tenant, hoping his gruesome act will win her affection and cement their bond in blood.
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