Pitfall (1948)

John Forbes is a family man who's tired of the 9 to 5 humdrum of his job an insurance company executive. Life gets a little more exciting for him when he calls upon femme fatale Mona Stevens. Her boyfriend has embezzled from a store insured by Forbes' company and has showered her with gifts using the loot. Forbes comes to collect the ill-gotten gifts, but the boyfriend is in jail, and Forbes falls hard for Mona and begins an affair. The only problem is that MacDonald, a private dick who freelances for the insurance company, has had his eyes on Mona first. The obsessed MacDonald turns the soon-to-be-released boyfriend against Forbes.