In Synthetic Men of Mars, Carter is joined in his adventure by Vor Daj, one of his courageous, young, ed warriors; together they venture into new lands in search of Rav Thavas-the mastermind of Mars-and perhaps the only one who can restore the beautiful Deja Thoris to health. Thavas, however, is preoccupied with sinister and dangerous plans of his own. In Llana of Gathol, the tenth adventure, Carter fi nds himself incarcerated in the Pits of Horz, with giant rats for company-then the dead rise from their tombs and the heroic exploits really begin.