Chapter 3 - Profiler's Memories (2) | Collectibles Murdered: SS Guide

You will find the next clue on the second floor of the Police Station. Head to the Detective Offices. Go straight to the end and turn right, then turn left. Go through the door saying "Baxter". Behind the desk, on the floor, there is a note: Insights on the Killer's Motives.

There are a lot of papers on the desk.