Boss is a tough loner, a historian with more interest in artifacts than in people. A space-wreck diver by trade, her curiosity is piqued when she locates a huge, ancient, seemingly Earth-made spacecraft...that shouldn't exist. Boss hires a team of divers to help her investigate, and they soon discover lost--and deadly--technology on board that could rewrite history, cost lives, and trigger an intergalactic war. Part space adventure, part mystery, and part ethical exploration, this "thoughtful and compelling" (Library Journal) tale will resonate with SF readers who like well-developed characters and spare, elegant prose.