A phantom thief named Rusty Nail sends a letter to a mansion, saying they're going to steal their treasure. The Mikuni Detective Agency is called to protect the treasure, but are they up to this challenge?
A secret route?!
Ein Geheimgang?!
¡¿Una ruta secreta?!
¡¿Una ruta secreta?!
Un passage secret ?
Uma passagem secreta?!