“The Master Mind figured that there was an even chance of both men passing out when they met—and he was nearly right at that. But he was sure that one would die, and then, even if the other missed hanging, there would only be one man left for him to dispose of later.”
There weren’t as many details in the story as I would have liked to have, but it explained a lot.
“How do you figure out Cudner’s getting into the wrong room?” I asked.
“That was funny! Maybe it happened like this: My room was 609 and the killing was done in 906. Suppose Cudner went to the hotel on the day he knew I was due and took a quick slant at the register. He wouldn’t want to be seen looking at it if he could avoid it, so he didn’t turn it around, but flashed a look at it as it lay—facing the desk.
“When you read numbers of three figures upside-down you have to transpose them in your head to get them straight. Like 123. You’d get that 3‒2‒1, and then turn them around in your head. That’s what Cudner did with mine. He was keyed up, of course, thinking of the job ahead of him, and he overlooked the fact that 609 upside-down still reads 609 just the same. So he turned it around and made it 906—Develyn’s room.”
“That’s how I doped it,” I said, “and I reckon it’s about right. And then he looked at the key-rack and saw that 906 wasn’t there. So he thought he might just as well get his job done right then, when he could roam the hotel corridors without attracting attention. Of course, he may have gone up to the room before Ansley and Develyn came in and waited for them, but I doubt it.
“I think it more likely that he simply happened to arrive at the hotel a few minutes after they had come in. Ansley was probably alone in the