After the daughter of the prominent professor Icardi (Ferzetti) goes missing an investigation is quickly commenced, much to the chagrin of commisioner Solmi (Sabato) who thinks Icardi is receiving benefits because of his status and that instead the professor should be treated like anyone else would have been treated in his place. The girl is soon found, murdered, shot in the head. The investigation gets under way and with only a few, thin, leads to go by, it's not going to be an open and shut case... The excitement unravels.
100 miles north, a bit east and up, is Flåklypa... home of bicycle repairman Reodor Felgen and his two assistants - Solan Gundersen, morning bird and natural born optimist, and Ludvig who is a true pessimist.
After spending decades living in the shadow of his more famous and successful sibling, Consulting Detective Sigerson Holmes (Wilder) is called upon to help solve a crucial case that leads him on a hilarious trail of false identities, stolen documents secret codes.
During World War I, a German U-boat sinks a British ship and takes the survivors on board. After it takes a wrong turn, the submarine takes them to the unknown land of Caprona, where they find dinosaurs and neanderthals.