A faithful city guardian the Old Thomas, who has stood on the top of the tower of Tallinn Town Hall for centuries, is suddenly gone. He has neglected his post in order to go and protect a couple in love. The adventures of the Old Thomas and the historians who are chasing him through the romantic Old Town of Tallinn and the newer district of Tallinn. The whole film has the mood of song celebrations and the characters are always accompanied by music, songs and dance.

Andrei Vysotina, who has just graduated from the Naval Academy, is appointed commander of the ship Derzhavny. The hero challenges the commander of another ship in the Black Sea Fleet, whose wife he was once in love with.