Engineer Kallio, who is searching for uranium, arrives at the summer hotel owned by Director Lehtelä, accompanied by his assistants Joltinen and Pummi and painter Väinö. The manager's daughter Anni, his wife Mammi, and hotel employee Sirkka try to figure out the guests' secret identities.
Leni Katajakoski
as Anni Lehtelä
Martti Katajisto
as Väinö Virtanen
Pirkko Mannola
as Sirkka Mäkelä
Göran Cederberg
as Kalle Kallio
Toivo Lahti
as Edward 'Eetu' Lehtelä
Siiri Angerkoski
as Mammi Lehtelä
Hannes Häyrinen
as Joltinen
Eemeli
as Pummi
Pentti Viljanen
as
Ari Laine
as Kumpulainen
Heikki Savolainen
as Pitkänen
Veikko Linna
as Lihavainen
