Is it the end of the world. A flood is coming. Luckily for Dave and his son Finny, a pair of clumsy Nestrians, an Ark has been built to save all the animals. But it turns out that Nestrians are not allowed. Climbing aboard with the unwitting help of Hazel and her daughter Leah, two Grymps, I think they are safe. Until the curious children fall from the Ark. Now Finny and Leah fight to survive the flood and hungry predators and attempt to reach the top of a mountain, while Dave and Hazel must put their differences aside, turn the Ark around and save their children. It's definitely not going to be easy to navigate.