At the request of author Zacharias, Fredrik begins composing an opera, inspired by a summer walk in Backas, Espoo. He falls in love with Ebba, who sings like a nightingale about a young mermaid on the shore of the lake. Fredrik's infatuation causes a scandal in Helsinki society circles, as he is married.

• Suomen Filmiteollisuus
• Maaria Eira
• Thure Bahne
• Arvi Tuomi
• Aino Lohikoski
• Toini Vartiainen
• Yrjö Tuominen
• Esko Vettenranta
• Risto Veste