Body Double (1984)

Jake Scully comes home to find his girlfriend with another man and has to find a new place. In between his acting workshops and his job in a vampire B-movie, he scans the paper looking for anything. He happens to meet Sam Bouchard, a fellow actor who needs a house sitter. Both are pleased with the arrangement that will have Jake staying in the house and for a sweetener, Sam shows him his favorite neighbor, a well-built woman who strips with her window open each night. Jake becomes obsessed with meeting her and is able to help recover her purse from a thief, but shows his own phobia, he is incapacitated by claustrophobia when the thief runs through a tunnel. When Jake witnesses a murder, he finds out that the police love to pin crimes on peeping Toms. Jake discovers that here are just too many coincidences but must hunt them down himself without the police.