The overseers may call it Hell, but for Leila and the other clones, the mining base on asteroid Mizushima-00109 is the only home they've ever known. But then Leila's sister Lily is murdered, and the Overseers seem less interested in solving the crime than in making their mining quota and returning to Earth. Leila decides to find the murderer, just like the heroes of her old detective novels would. But Hell is a place of terrible secrets, and courage and determination - and a love of mysteries - may not be enough to keep Leila from ending up like her sister.