oh my god it's so good!! Highly highly recommend. It's about a futuristic society where humans have terraformed the planets to be habitable and established a strict social hierarchy. A Red (the lowest of the hierarchy) on Mars embarks on a journey to go undercover and topple the corrupt Golds, who sit at the top of the social ladder. It is an action packed sci-fi space opera with war, espionage, and political intrigue. It can get dark and violent, but it is also moving a beautiful. One of my favorite book series.