A Step into the Fog

From: Mr. Black
Description: The circus performers walked through the fog door and returned. I’ll repeat their path. This is most likely all safe, but it’s best to take precautions. Among the magician’s junk there’s a breathing mask. I’ll put it on after checking how it works. Pass me the tools.
Completed: The mask is working, which means I have protection from the fog swirling in the door. I can investigate further and repeat the same trick Diggs did at the circus when he robbed the Cabaret. Let’s see what his secret really is. Well, I’m off!