Three time capsule encryption

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

Children's Book
Secret elementary school detective / Solving difficult cases even for adults. ordinary elementary school students? A detective request email from the boss sent only to selected elementary school students. When you get there, you start to solve the mystery as "elementary school detective"! Doyle, Ranpo, Lebrun. the tricks of the masterpiece mystery novel will be revived with setting the present!