Day 5 - Book doesn't belong to me.
My books on my bookcase all belong to me... There is one possible exception though. Last week I acquired a book called 'Lost Horizon' by James Hilton. Mum passed it on for me to read. We often have very similar tastes in books, so whatever she likes, I tend to like - and vice versa.
I've never heard of this book, or it's author. So it is currently at the end of the very long "yet to read" pile I have! Luckily, the summer holiday is approaching, and I tend to make a good dent in the pile then. :)