Legend

Yellow - Key items
Red - Main area of interest
Purple - Mini-game

Turn on the lights and then you start playing the mini-game to earn the badge box. The badge box has an item that should allow you to open the zipper on the coat. There are notes here that should help you get the code to unlock the evidence safe.

And then betrayal begins, just look around for something that should help you against villainous people. There you go, a bust, throw it to [redacted] face!