Last book you found unputdownable?

I'm reading Daughter of No Worlds and it's all I can think about. Only started yesterday and I'm probably going to be done tomorrow. I have been reading in every spare second!

What's the last book that you found absolutely unputdownable?

This has been refreshing because leading up to this book I read two other widely recommended series that I realllly found to be lacking. Glad I picked up this book to restore faith and enthusiasm in the genre!