Rebels on the red planet! Considered by many to be the only true equal of Edgar Rice Burroughs, Otis Adelbert Kline was a master of the sword and planet genre. From his position on the original editorial staff of Weird Tales and as the literary agent for Conan creator Robert E. Howard, Kline helped shape the face of science fiction as we know it. Now, in its first complete edition since 1933, Kline brings us the story of Harry Thorne, outcast scion of a wealthy East Coast family, who agrees to swap bodies with a Martian noble, thrusting him into a fierce and vibrant world of strange beasts and stranger people, where a man's future is determined by the strength of his sword arm. Tasked with tracking down and neutralizing another Earthman before he establishes a corrupt empire, and trapped between the love of two beautiful and dangerous women, will Harry Thorne wind up a slave in the dolorous baridium mines, or will he step forward and claim his destiny as a swordsman of Mars?