The fleet is turning down. Toward the heart of the world.Cade Ferro sang the Combine's weapon into slag and lived - and in living, he taught Iselle Cray the one thing she needed to know: a bonded man can carry the whole song of a living world and survive it. Now her acquisitions fleet is descending the Deep Road, past a hundred miles of dark no one has walked since the first expedition died down there, toward the trunk every clan-road branches from - the whole Mother in a single note. Cray means to sing it out of the ground in one killing chord. The largest extraction in company history.And the arithmetic is cruel. The core cannot be reached from above; thirty years of cutting proved it. The only way down is a door a dead keeper sealed with his life, and the only hand that can open it is Cade's. Cray doesn't have to beat him to the bottom. She only has to take him alive and let him carry her key to the exact place she needs it - thinking, the whole way down, that he is winning a race.So Cade goes first. Down into the deep that made him, toward the wreck of the world he was born on, past the great creature he once bonded and lost to the gray. Beside him walks Ysa - who has read where this road ends better than he has, and is coming anyway. To save a world that reached up out of its own dying to give him back, Cade will have to become something no man comes back from whole.The First Road is the final book of The Maroo Cycle, the epic science-fantasy trilogy that began with The Salt Road - a story of living worlds, found family, and the cost of belonging, for readers who want their adventure planet-sized.