The galactic trade ship Lydis is making a run to the planet Thoth when a civil war lands her in a battle of ancient powers and nameless evil, with a Forerunner treasure at its heart. The crew seems normal-until you look closely at two of its members: Krip Vorlund, a man who walks in a body not his own, and his pet, a four-legged beast hiding the mind of Maelen the Moon Singer, a woman whose esper powers can save them all-or bring them to eternal destruction.