Ten years after John Carter was transported back to Earth against his will, he returns to Mars. Having been sent back to Earth before the birth of his child, Carter is desperate to reunite with his wife, Dejah, and meet their child. However, the reunion is forced to be postponed when Carter realizes that he materialized in an unfamiliar part of the planet. Known as the Valley Dor, Carter has landed in the Barsoomian afterlife, where no one is allowed...

When John Carter discovers that his beloved wife, Dejah, has been imprisoned in the Temple of the Sun, he is desperate to rescue her. However, the prison, which slowly rotates, is only opened once a Barsoomian year. As Dejah's prison sentence drags on for over a hundred days, the window of opportunity is narrowing for Carter to save her. Amid social and political unrest from the last war, the Thern had appointed a new leader, but many still believed...