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?
Our family treasure,
Unserer Familienschatz,
El tesoro de nuestra familia,
El tesoro de nuestra familia,
Le trésor de ma famille,
une statue d’homme en or.
Uma relíquia familiar,