(Russian: Попутного ветра, «Синяя птица», romanized: Poputnogo vetra, «Sinyaya ptitsa») is a 1967 Soviet-Yugoslav children's adventure film directed by Mikhail Ershov, based on the eponymous story by Boris Kosier.

[1][2] Aboard the schooner "Blue Bird" traveling on the Adriatic are schoolchildren, winners of the questionnaire "For Peace and Mutual Understanding".

Taking advantage of the fact that the ship, when entering the ports, is released from customs inspection, an international gang organizes the delivery of a consignment of drugs.

A radio amateur from the US, schoolboy Ralph and his Yugoslav friend, Milan, consider the behavior of Monsieur Vilar, the pediatrician attached to the expedition, as very strange.

During the performance at an improvised concert, the guys search the artist's cabin and find the drugs hidden in paint tubes.