Ten-year-old Ole is full of mischief. He attempts to fly and is hospitalized with a broken leg. When he sees a Sherlock Holmes movie on TV, however, he forgets about the pains and comes up with a new plan. Disguised as Sherlock Holmes and Dr. Watson, he and his friend Andreas start searching for criminals. Soon, the two boys detect their first case. On the street they meet a man wearing a stuck-on beard. The hobby detectives find this very suspicious and decide to follow him.

Alexander Heidenreich
as Ole

Dirk Bartsch
as Andreas

Peggy Steiner
as Marie

Matthias Krohse
as Jens

Swetlana Schönfeld
as Oles Mutter

Gert Grasse
as Oles Vater

Renate Heymer
as Andreas Mutter

Hilmar Baumann
as Andreas Vater

Peter Bause
as Oberleutnant Vogel

Dietmar Burkhard
as Leutnant Büttner