After finishing my shift in the press room at the local newspaper, I had returned home. As I entered the apartment block’s communal hallway and went over to collect my post, I saw that someone had changed the padlock on my letterbox. I knew that my own padlock had never been very secure, and I always expected someone to cut it with a bolt cutter to steal my post. However, I never thought anybody would go through the trouble of replacing my own lock with theirs, but clearly someone had done just that. Then I saw a sticky note written by my friend Henry. It seemed that I had to solve a little puzzle to work out the code of the new padlock, which, unbeknownst to me at the time, was going to lead me down a rabbit hole of puzzles of ever-increasing difficulty which would eventually help me uncover a major conspiracy in Escape Room Puzzles by Carlton Books.