The telepathic U'tanse always thought of themselves as human, even though the fabled home planet of Earth has been lost to them for ages.
Ohen bar Clay joins the starship Leonardo on its journey to hunt for lost Earth. When he senses human thoughts from a world that looks like Mars, he undertakes a solo mission to see for himself if this star system is the home of humanity. Alone on a world where humans fight among themselves, he has to survive until the starship returns for him.