I think only one word will fully describe this book "P-E-R-F-E-C-T" 
 First. This idea is so good and so well developed! There's this society where the persons are divided in groups by colors, there are yellow ones, pink, yellow, blue. And the most important are the golden ones. And the "salves" are the red ones. 
 In this universe. The humanity has archived to own some planets of the universe and they have send some people to mars, to explote its goods. And there's where the red ones take place. They are responsible of getting the goods in mars, and they work in mines. 
 And there's Darrow (the principal) who is a red one. 
 The characters. MOTHER OF ALL GOOD BOOKS. All the characters are perfect. While you read this, you can actually feel what they feel. 
 And the way the book develops. The story traps you since the first page. 
 Like Darrow would say "YOU'RE GOING TO BLOODYDAMN LOVE THIS BOOK"