Book #4 in the Barsoom series.

Mars has become divided by love. Not one, but two princes and a Jeddak are vying for the love of Thuvia of Ptarth. When she is mysteriously kidnapped, treachery threatens to throw Barsoom into bloody war. Now Cathoris must follow in the footsteps of his father, John Carter, and overcome phantom armies, dangerous spies and savage beasts as he attempts to save his true love and reunite Mars.