Marco is watching TV when he makes an amazing discovery - Ax is not the only Andalite on Earth! But the Animorphs aren't sure whether this is good or bad news - could it mean there's another Andalite Controller to equal Visser Three somewhere out there? But no, the truth is far stranger...An injured Andalite and another dying of a terminal disease. They seem harmless, but Marco's sure there's something the Andalites aren' telling them...