The House Across the Lake (1954) Yank title Heat Wave - WHY I've NO IDEA - GRRRR!! Bloody Yanks
Reminded me of a number of films, but nonetheless a good yarn with Sid James (how I traced the film) in a serious part and American Alex Nicol I've seen now for the third time, he being the one previous with the weird haircut and not a reporter this time doing the police's job, and the Canadian/American Paul Carpenter yet again. Mix in blonde American femme fatale Hillary Brooke (no, I'd never heard of her before too, and she had a very good English accent), and you have an explosive mix of four way love betrayal.
Oh, and the policeman I just about recognised (how short he was!) was Alan Wheatley who played the Sheriff of Nottingham in the late 1950s TV series The Adventures of Robin Hood.
Good film