Zak Nine and Erro have escaped! But now they find themselves lost in a vast forest of alien birds and deadly plants. Things get even worse when they hear strange buzzing sounds just above the treetops - attack drones! The prison guards are searching for the boys using a flock of remote bots, armed with flame-throwers and sleeping gas. Will the boys outwit the bots and find a way off Planet Alcatraz? The exotic flora and fauna just might provide a solution to the high-tech hazards hunting our heroes.