Elantris by Brandon Sanderson

In this book Sanderson writes about a land that's been struck with a mysterious plague--whereas in the past people were changed into shining beings with God-like powers, now they become pitiful corpses. As political and religious tensions run higher, a princess whose intended husband has been struck with this plague and hidden in the city of Elantris must navigate the perils of an unfamiliar court, while her betrothed works against time to figure out the mystery of the plague and a priest from an unfriendly religion tries to figure out how to convert the city before the troops of his religion take it by force. This book leaves some unanswered questions, and doesn't fit together quite as well as the Mistborn trilogy, but it's still an amazing read.