Private bussiness. Hunt for katana. Fedorova I.

Non -Lumina of friends - Stas, Alika and Nick - classmates nicknamed "Three Musketeers." Having read detectives about young detectives, the guys dream of secrets and adventures. And they do not force themselves to wait! The new academic year barely begins, Alika abducts on the way from school, and during the autumn holidays, the boys face the unusual mystery of the katana stored in the collection of Nika grandfather.