Swords Of Mars Synthetic Men Of Mars Author:Edgar Rice Burroughs 2 in 1 Book Club Edition that contains both books: — Swords Of Mars -After being relegated to the background for the previous four Martian novels, "Swords of Mars" brings John Carter back to the forefront as he vows to bring an end to the Assassins Guild and travels to one of Barsoom's moons. — Synthetic Men Of Mars - John Carter desperately neede... more »d the aid of Barsoom's greatest scientist. But Ras Thavas was the prisoner of a nightmare army of his own creation -- half-humans who lived only for conquest. And in their hidden laboratory seethed a horror that could engulf all of Mars.« less