Finding Out Who: Murder Case 1

(Finding Out Who: Murder Case 1, this is the first book of my murder case series I am going to be writing, by the way, if you're wondering why this specific story sort of sounds familiar in some scenes, I used scenes from the Jim Carrey film; The Mask. The Bruce Wayne in these stories is the Christian Bale one.)
You are good friends with Bruce Wayne and bump into him again as you got run over.
Something triggers a memory of yours, a bad one, that makes you the opposite from sane.
Your friend has died and the cops and detectives are trying to help you find out who did it or if he did it himself, but you know he wouldn't.
You and Bruce get close, too close and he helps you with every situation you're in.