The Mysterious Stranger

Dr. Tokaden Kornél, a foreign spy, persuades Félix, a debauchee and the twin brother of Arácsi, an engineer, to steal some important documents from his brother's office. Having lured his twin brother away from the factory, Félix successfully carries out Tokaden's instructions. At first Arácsi becomes the main suspect, but, in the end, Annus, his fiancée and the boy scouts of the Fráter György Grammar School find out about the two real culprits. (official distributor synopsis)