Max signs on as a steward's mate third class, and then he absorbs the contents of the Stewards' Guild manual using his eidetic memory. Among his duties is caring for several animals, including passengers' pets. When Eldreth "Ellie" Coburn visits her pet, an alien, semi-intelligent "spider puppy" that Max has befriended, she learns that he can play three-dimensional chess, and challenges him to a game.