When twins Grace and Marty lose their parents in a freak accident, they are sent to live on a secret island with their mysterious uncle. Uncle Wolfe is a scientist obsessed with cryptids - animals that have never been proved to exist. And he needs the twins' help...A dinosaur egg has been discovered in the Congo and Marty and Grace must track it down. But Uncle Wolfe's nemesis, the evil Dr Blackwood, will do anything to find it first and steal it for himself.