Everyone thinks Evan is sick . . . Everyone thinks science will find a cure. But Evan knows he is not sick; he is transforming. Evan's metamorphosis has him confined to his bed, constantly terrified, and completely alone. Alone except for his visits from the Wuftoom, a wormlike creature that tells him he is becoming one of them.

Clinging to his humanity and desperate to help his overworked single mother, Evan makes a bargain with the Vitflies, the sworn enemies of the Wuftoom. But when the bargain becomes blackmail and the Vitflies prepare for war, whom can Evan trust? Is saving his humanity worth destroying an entire species, and the only family he has left?