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.
Anni Lehtelä
Väinö Virtanen
Sirkka Mäkelä
Kalle Kallio
Edward 'Eetu' Lehtelä
Mammi Lehtelä
Joltinen
Pummi
Kumpulainen
Pitkänen
Lihavainen
Pätkänen
