Peter Hellinga finds an ancient Maya codex in Mexico. This is a special document that states what will happen in 2012. Shortly after the discovery, Peter is attacked and imprisoned. He warns his grandsons Hidde and Twan and instructs them to get the codex to safety if something happens to Peter. The adventure begins when Hidde and Twan are waiting for their grandfather who comes back from Mexico and only the luggage arrives. After that, their home is also broken into. They wonder if the burglars are looking for the codex and where their grandfather is.