After finding Tano's tomb in Satana, Ringo and Arjun uncover a vital clue to the Gem of Death. But there's one problem-the only one who knew its location is already dead.And Ringo left his body at the bottom of the Great Gas Sea.To retrieve Rickart's skull and revive him, the crew of the Soulchaser must descend into the mist. What begins as a daring expedition becomes a nightmare. The deeper they go, the more they lose-time, sleep, hope. Corrosive air, ravenous mistians, and colossal titans stalk them at every turn.But when the pieces of the Staff of Crux are at stake, even enemies become valuable.Now Ringo must do the unthinkable: Rescue the man he once abandoned to die-before the Sea of Bones claims them all.