Detective "Captain Ryabinin" talks about the work of Soviet security officers. In the luggage of a foreign tourist, customs officers discover microfilms hidden in a souvenir doll. On microfilms there are secret data that one of the Western intelligence services is hunting for... The action-packed detective story “Knight's Move” is about the struggle of the police and vigilantes with a gang of criminals who use karate techniques during robberies. The plot of the story “Red Larches” centers on the conflict in scientific environment. The young scientist Vladimir Kravchuk stubbornly, without sparing himself, fights against inertia and bureaucracy, defending the project he developed for draining coal mines.