The secret of the haunted hotel Max and his monster friends receives a distress call from Count von Hohenhurz: There are no more ghosts in his hotel in Knatterbach, which is why the guests are staying away. The Count urgently needs a replacement. The monsters set off on their journey. In the haunted hotel, Max and his friends discover a spooky crypt. However, in their excitement, they do not notice that the monster hunter Karla Kätscher has followed them.