Overview:

There is confusion when Appie returns to the House of Anubis with the promise of wealth, as stated in an invitation he received. Fabian and Amber also return to the now dilapidated house, just like Marcel, Pim, Raphael and Sterre (the five of the sword). The seven ex-residents lose all contact with the outside world. Before the day's end, the seven must solve one very last mystery.