Music in the Harbour (1937)

Original title: Havenmuziek

Frits and Jef are mates on a ship and have been friends for long. Frits, who is the steward, is also engaged to Jef's sister Marieke. When the two men disembark in Antwerp, their birth town, Frits realizes to his shock that a drug runner has hidden his contraband in his baggage. He informs the police at once and starts his own investigation...