Book Challenge 3

Day 3 of 7: I've accepted a challenge from  who is obviously as nosey as I am about the books that people love! Each day for seven days, I will post the cover of a book I love with no explanation (well, maybe a little comment if I feel like saying something!)and no reviews. Each day I'm supposed to invite a friend to join the challenge. I'll pass on the 'tagging' bit of this because I know how sometimes it can be a bit too much to take on something else - but if any friend cares to join in (yes - I really am nosey, just dodging the issue!) the please tag me to let me know so that I can visit your Facebook page and satisfy my curiosity - and maybe collect a few new titles for my mountainous TBR pile - like that is something I really need!
Today's book is a bit of a cheat - it's what I'd call my Desert Island book if I was ever put on Desert Island Discs and had to choose one book to take with me.
One book?!