Henkka Virtanen finds evidence of a possible crime on his way to school. With his friend J.K. Kivimutka, the boys decide to investigate what has happened, because these criminal cases are the responsibility of the detective agency they have set up. When it turns out that mailboxes in the area have disappeared during the night, the detective bureau has already two crimes to solve. A fun and exciting adventure begins, in which the boys also have to face their own fears.
Mikael Ehn
Veetu Hietanen
Anna Pitkämäki
Tapani Kalliomäki
Annu Valonen
Pirjo Heikkilä
Sira Junno
Verneri Tinkanen
Heikki Nousiainen
Kaija Kiiski
Santeri Töyry
Anton Riihilahti
Satu Säävälä
Rami Rusinen
Suvi-Sini Peltola
Tom Petäjä
Väinö Weckström
Sisu Aro
Markus Karekallas
Väinö Karhos
Liina Mäki
Edith Mäki
Raimo Hauta-aho
Tuire Arola
Jarttu Mustonen
Paula Pakarinen
Jarkko Felin
Katja Kivistö-Leikkonen
Amadeu Vives
Pentti Rissanen
Jenni Vuorio