Have you ever finished a book in just one sitting? What book is it?

If a book is so much fun, I can finish it in just one sitting on a weekend. There's something magical about immersing myself in a well written story losing myself in the characters and their world. When I find a book that truly captivates me I can't help but devour it in one go.

Have you ever finished a book in just one sitting? What book is it?