A routine helicopter muster in Queensland becomes a fight for survival 65 million years in the past.Finding dead cattle during the muster was the first sign that something was wrong. The trees and lake were the second and third. But instead of going home, Jessie Hall, his nephew, stockman, and a neighbor investigate.Jessie feels safe in the R22 helicopter but when something large knocks him out of the sky and he's forced to ditch into the water, he realizes while they might still be in Queensland they have ended up in the past when the Eromanga sea existed, pterosaurs rules the skies and what lives in the ancient forest is even worse.To get home they'll have to cross the prehistoric sea where the Kronosaurus hunts.