Her Alibi

Tom Selleck is the titular character, "her alibi," who provides a beautiful murder suspect with a false alibi because he believes she is innocent. However, once he brings her back to his house, he begins to believe perhaps he was wrong - and now she is trying to murder him so that he cannot go back on his word.

Selleck's character also happens to be a mystery writer of cheap paperback books so he uses what's happening in his life as a parallel to his story, so at moments throughout the film we hear voice-overs of the story being narrated and it's played for comedy (example: Selleck makes a lot of noise while spying on the murder suspect, then in voice-over he reads a line from the book he's writing and says that the character in the book "quietly snuck up on the girl.").

Not a great movie, but it will entertain you.