Plot goes something like:
A man is being interviewed by a blonde woman, his lawyer in his hotel room. He recounts the whole story of what happened through the film, and then at the end of the film there is a massive plot twist in which the lawyer actually turns out to be someone else, who gets him to sign something to prove that he actually committed the crime. They has also been watching from the building opposite his office and the real lawyer finally turns up. Ring any bells?