I think you'll like it. It's a really smart book. And there was a pretty good radio drama based on it that I'll try to find for you too.
[Five] It's an incredibly simple answer, really. People just overthink riddles. But I won't say any more lest I give it away! And I can't do that. Because what will you have to look forward to, then?
I'm glad. I had another one started for you, but I got a little distracted.