I'm not even sure how to describe this or how I felt about it. It's a fantasy novel set in a world where sins are eaten by the aki, an underclass of people living in Kos. The sins eaten by the aki manifest themselves as tattoos on their skin, making it very obvious who are aki, and how many sins they've eaten. Tochi Onyebuchi takes this concept and weaves a world and a story that is beautiful and complex and devastating all at once. Onyebuchi imagines the power dynamics and struggles that might come from a society that operates this way, as well as the potential for revolution and the catalysts for change. The result is simply amazing, and there better be a second book!