After a ten-year hiatus, John Carter returns to Mars and finds himself in the Valley Dor, a place no one is meant to leave. This is the Martian version of the afterlife. Here, Carter unearths a sophisticated plot masterminded by the Therns, who have used bogus religious promises to trick the other races of Barsoom for millennia. In addition to his ally Tars Tarkas, Carter makes new friends in the Thern princess Phaidor and the...