The History of Monopoly Sets

Brigadier Norma Crockett's saying to Clutty, Christopher Clayton Houghton, was inventing this stuff. They could hide secret messages in the front of the bank. The knight on the chess set, you unscrew the head the wrong way. And inside it's hollow and it's lined and they would actually smuggle ink in there. I'm amazed at why don't we not know about all this stuff? You write about the maps are obviously very important if you're going to escape. How are maps produced in this way? But it's finally any ways whatsoever. It's like Monopoly said as well, what happens in what happens in Monopoly?