Tress of the Emerald Sea

Brandon Sanderson tries to combine The Princess Bride and Discworld, and manages to pull it off pretty well. It takes a second to get going, but once it's rolling it's hard to put down.

This is the first of Brandon's "secret novels" whose publication was funded by Kickstarter. It's fun and enjoyable and had lore bits for those wanting to sink their teeth into the wider Cosmere.

I also imagine it does fine on its own.