Jamie, Tom and Wanna are back in the Permian for another adventure. When a pack of wolf-like lycaenops come races past chasing a giant lizard, it's obvious to the friends that they should keep clear of these carnivores. But when the creatures collapse to the ground, the boys realize that there's something wrong. The lycaenops are starving and won't survive much longer without the boys' help. But how do you herd a pack of carnivores to a tasty meal without turning into the meal yourself?