It's more than a century since the atomic bombs exploded over Maralinga, but fear still rules Outback Australia. Now the Lizard Clans have rebelled, and Boomer and the Rangers must abandon the Quest and pursue the renegade Fril and bring her back to justice. As the mysterious caves give up their fabulous secrets the Kirra, a high-tech boomerang with an attitude, leads them from past to future past, and the truth is finally exposed. Or is it? While the animals now look like humans, what's making the Fellers behave like animals?