The Chessmen of Mars

The Chessmen of Mars is an Edgar Rice Burroughs science fiction novel, the fifth of his famous Barsoom series. In this novel Burroughs continues to focus on the younger members of the family established by John Carter and Dejah Thoris, protagonists of the first three books in the series. The heroine this time is their daughter Tara, princess of Helium, whose hand is sought by the gallant Gahan, Jed or prince of Gathol. Both Helium and Gathol are prominent Barsoomian city state/empires.