Hi, I'm pretty new here an I wanted to get some help about a puzzle. My friend sent this GIF to me and I've been trying to decode it for 2 days now (mind you, I'm pretty good at these kinds of games, I've been a fan of Sherlock Holmes detective board games for years).
If anyone has an idea on how to solve it (or maybe just a clue so it won't take the fun out of it), I would really appreciate it.
Thanks!