War of the Orks: Warped Galaxies: Warhammer Adventures, Book 4 (Unabridged‪)‬

Still searching for the Emperor’s Seat, Zelia, Talen and Mekki arrive on the jungle planet of Weald. Accompanied by the ingenious alien ape Fleapit and the dashing Rogue Trader Amity, Zelia and her friends become embroiled in a war between two brutish tribes of green-skinned orks! Only by using their wits can they hope to survive this savage encounter.... 

Written by Cavan Scott. Narrated by David Tennant.