Or so says the leading man in the film at one point. Sadly, he's wrong. This might have made a middling 30 minute episode of some TV series like 'Tales from the Darkside,' but doesn't cut it as a full length film. Other reviewers say the ending was the best thing about this but if you'd seen or read a number of horror/mystery films/stories, you can pretty much guess what's going to happen.
Still, it's OK in it's own way if your expectations are set suitably low and the idea itself is reasonable. A murder in the past continues into the present.
They didn't push the boat out with the special effects though, the journey into the past of the 1940's is portrayed by the radio playing old songs and war news, a newspaper will a war headline and a vehicle from the period. Well...that would convince anyone they'd gone through a time warp....er....perhaps not.