Engineering student Petteri and retired captain Jere Renkonen arrive in Terijoki as guests of architect Matti Marras at the villa he has rented. In the midst of everything, the owner of the villa, Russian émigré prince Asatiánts, arrives with his niece Darja. Petteri eavesdrops and learns that the prince is expecting a "man from Marseille" at the villa. This man is supposed to take a secret document hidden in a large cabinet in the hall across the border to Moscow, containing information about the hiding place of the prince's family jewels.
Ensio Jouko
Prince Svjatomir Asatiánts
Ellen Parviainen
Darja, the prince's niece
Kerttu Krohn
Miss Lily, Darja's companion
Kyösti Erämaa
Matti Marras, architect
Kaarlo Angerkoski
captain evp Jere Renkonen
Leo Lähteenmäki
Petteri, engineering graduate
Leevi Linko
vääpeli Mehto
Hugo Hytönen
General Velikov, "the man from Marseille"
Toppo Elonperä
Pjotr
Arvo Kuusla
mies Marseillesta nro. 2
