The appearance of monstrous monsters, intoxicating smells in the forest, mysterious barrels with an ominous mark in gloomy basements interested young detectives. The investigation leads friends to a secret laboratory... The disappearance of an eccentric professor and searches in his house, accidents and deadly traps, knightly tournaments in ancient castles and chases in modern cars - all this accompanies the friends in their search for the mysterious “millionth stork.”