The Thin Man by Dashiel Hammett
Let’s get one thing straight, Nick Charles is not working on the Julia Wolf case. He’s not even remotely interested in working on the Julia Wolf case. He’s just here in New York to spend some time with his wife and their dog Asta. Yes he was a detective, but he’s been out of the game for years.
Problem is, nobody believes him. The cops don’t believe him, the newspapers don’t believe him, even the main suspect doesn’t believe him.
Oh well, if nobody believes him he might as well take a look.