A three-book paperback collection of the popular Red Rising dystopic sci-fi series is on sale at Amazon. The series, penned by author Pierce Brown, is set hundreds of years in the future after humans have colonized the solar system and established a new caste-based society. The books follow Darrow, a Mars-born human of the lowly "Red" caste who discovers a secret about the planet that sparks him to free his fellow Reds.

The paperback set includes the first three books in the series, Red Rising, Golden Son, and Morning Star, plus an excerpt preview of the fourth entry, Iron Gold. You can pick it up at Amazon for just $41 (was $54).

Alternatively, there's also a five-book paperback set that includes the full-length version of Iron Gold plus the fifth book, Dark Age, for $45 (was $49).