A story about the passengers of the inland waterway Heinävesi. Salli, the daughter of the captain, dreams of an acting career and joins a performance by a theater company traveling on a ship.
Don Juan arrives in a Spanish town and immediately becomes embroiled in amorous adventures. While looking for love affairs, he meets the beautiful Donna Anna, the commander's daughter, who mistakes the masked cavalier for Don Octavio because of his height and clothing.
Since the capable landlady Maria bears a striking resemblance to the ruler of a miniature state, she is tasked with playing the role of princess during her absence.