A Princess of Mars is a science fantasy novel by American writer Edgar Rice Burroughs, the first of his Barsoom series. It's the beginning of an incredible odyssey in which John Carter, a gentleman from Virginia and a Civil War veteran, unexpectedly finds himself on to the red planet, scene of continuing combat among rival tribes. Captured by a band of six-limbed, green-skinned savage giants called Tharks, Carter soon is accorded all the honor of a chieftain after it's discovered that his muscles, accustomed to Earth's greater gravity, now give him a decided advantage in strength. And when his captors take as prisoner Dejah Thoris, the lovely human-looking princess of the city of Helium, Carter must call upon every ounce of strength, courage, and ingenuity to rescue her-before Dejah becomes the slave of the depraved Thark leader, Tal Hajus!