But where is it?

I'm sure we have a green Michelin guide to Corsica we bought last year. I've spent 2 days looking for it. Did this book ever exist? Am I looking for something that is a figment of my imagination? I don't think so. I know what it looks like, how it feels (the pages are a bit flimsy), the dirty mark where we've flicked through it... It's driving me mad "knowing" this book is somewhere in the flat but isn't in any of the usual places. Send me book-finding vibes before I go bonkers!