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.

Maaria Eira
Ebba Dunckert

Thure Bahne
Fredrik Pacius

Arvi Tuomi
Zacharias Topelius

Aino Lohikoski
Nina Pacius

Toini Vartiainen
Margarethe Florin

Yrjö Tuominen
Martin

Esko Vettenranta
Nikolai Kiseleff
Risto Veste
Adolf Wasenius
Eero Kilpi
Topi Ruuth
Eugen Bergfält
Lauri Kyöstilä
Pavén
Edvin Kajanne
P.V. Florin
Irja Kuusla
Tilda
Sointu Kouvo
Hanna Falkman
Laina Laine
Mrs. Florin