Twelve-year-old Arcturus Betelgeuse Chambers comes from a family of stargazers and his quest to find life on other planets is unstoppable. Soon his family announces they are moving to Las Vegas, where Arty will no longer be able to stargaze in the City of Lights. Arty has to stay with his scary next door neighbor when his aunt goes to the hospital to have a baby and his parents are away house hunting. As it turns out, the scary neighbor, aka "Death," isn't terrifying at all-he's actually Cash Maddox, a bonafide astronaut! But when Cash falls ill, Arty must find the courage to complete his mission by himself. Can he prove there is life on Mars after all?