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.

The boisterous good humor of Jurmala, the nickel-mine owner, is, if anything, only barely dented by the raging battles in Finland before, during and after World War Two. In fact, everywhere he goes, he meets prospective customers on all sides of the conflict with his all-inclusive greeting "Friends, Comrades." Indeed, the resource he is wrenching from the earth's bowels is necessary to all forms of industrial activity, and is especially necessary for military applications. Thus, he has no reason to fear that he will ever run out of customers. This doesn't prevent him from using every possible means to entice them. At home, his relationship with his wife is not so prosperous, and they resort to some extraordinary means to try and keep on an even keel.

Deaf artist Joel lives with his parents on a small farm, where he and his paintings are not appreciated.

Hese, the shy owner of a video company, travels on a moped to film a commissioned Christmas party. From the steps of his office, Hese finds an anonymous Christmas present, a Hese slipover, and begins to find out who it is from.