Foundation

Foundation - Ann Aguirre This was a free short story that takes place before the events of Enclave, the first book in the Razorland trilogy. We learn more about the virus that sent families underground, and get a glimpse into the life of a young 14-year-old boy named Robin, one of the original settlers of the enclaves.

This book won't mean much to you unless you also read the Razorland trilogy, which is indeed a fantastic read. I've actually still got the last book in the trilogy, Horde, left to read but wanted to catch up on a few of these short stories first. :)