Das Geheimnis vom Bergsee (1952)

Pietro Ponz lives a happy life in the mountains on the Swiss-Italian border with his mother Lamberta. No one but his mother knows that Pietro is a girl, a deception that Lamberta was forced into by a series of tragedies almost twenty years previously. Not long after her husband Joseph Ponz died, Lamberta also lost her fragile infant son, Pietro. Whilst mourning this double loss, she began an affair with Bolzano, a notorious smuggler. After Bolzano was killed by the customs men, Lamberta gave birth to his child, a little girl that she decided to pass off as her son Pietro, in the hope of securing an inheritance from her husband's wealthy parents. Now that Pietro is fast coming of age, his tutor and grandmother are adamant that he should be sent to a religious school. Pietro escapes from the school and joins a gang of smugglers...