What's your go-to comfort book?

This must've been asked dozens of times, but surely the diversity of answers to this question has no limits.

Which book feels like a warm blanket wrapped tightly around you? Which book could be read time and time again and still thrill your heart?

For me, it would be Jane Austen's Northanger Abbey. I adore Austen's works, but for some reason Northanger Abbey is chocolate for my soul. It's a breeze to go through and every page is delightful.

Or perhaps that's because I have an unhealthy infatuation with Mr. Tilney.