Americanah by Chimamanda Ngozi Adichie had me gripped over Christmas. Also a book called The Mountain Story by Lori Lansens was perhaps one of the best books I read last year - I literally couldn't put it down: http://www.goodreads.com/book/show/22856128-the-mountain-story Edited to say another huge favourite of mine in 2015 was A Little Life by Hanya Yanagihara - it's massive, and it's very, very dark but by god, it swallowed me whole.