Knack' Attack: A Tale of the Human-Knacker War

On the farming planet of Terr'ferme, 15-year-old Rabbs din Chorest has just been made Hand, and sent to the Blackmarker Hills to tend a herd of clorses (cloned horses) and beefers. Then the Knack's invade, Rabbs is cut off from civilization, and a party of refugees appear. Trapped by a bug troop in a cave near a ruined alien city, the humans have nowhere to go and no one to ask for help. Will anyone survive the Knack' attack?