It is a science fantasy novel written by Nigerian-American author, Nnedi Okorafor. It was first published in 2010 in the USA and it was later published in Nigeria in 2017 by Ouida Books. It is now optioned as a TV series for HBO, with executive producer George R. R. Martin! The book won the 2011 World Fantasy Award for Best Novel. It also won the 2010 Carl Brandon Kindred Award.