Swords of Mars — Edgar Rice Burroughs

In SWORDS OF MARS, John Carter, determined to stamp out the practice of assassination on Mars, goes to the city which is the headquarters of the assassins' guild. There he encounters the brilliant and evil inventor Fal Sivas, who has created a ship which for the first time will take Barsoomians off their planet to visit the moons of Mars. And there John Carter learns that the head of the assassins' guild has captured the incomparable Dejah Thoris