Max's father is a famous scientist who disappeared many years ago. And then one day Max decides to go in search of him, because living in his grandmother’s house in a sleepy town is unbearable. Max could not even imagine that his search in the company of an eccentric girl named Emma would lead him to an amazing underwater world, a country called Zeeland, securely hidden underground. Max discovers that many people here know his father and that other people are also disappearing without a trace. What dark secret lies behind the beautiful facade of the sea country? And will Max and Emma be strong enough to get to the bottom of the truth?