Massif by Garth Nix (Hardcover)

Massif is a stand-alone novel that marks bestselling author Garth Nix's first adult science fiction. For two centuries humans have traveled between stars by riding the Massifs, vast sentient mountain ranges that carry colonists and an ongoing Earth-Mars war across the galaxy. Ship Leader Parnell and the crew of the corvette Sassafras are not supposed to question why. Now they must seek answers to save themselves and the future of humanity.