Latvia in the late 19th century. Edgars, the coachman of Alaine manor, loves Kristine, the washerwoman's daughter, although he is too hot-headed for Kristine's mother to consider him a good suitor for his daughter. Servant Viskrelis and stable boy Sutka try to tempt Edgars to a life of drinking and a relationship with the barmaid Matilde. Meanwhile, Kristine is courted by a rich landowner, Akmentins.

The 30-year war still goes on. Riga headmasters have decided to submit themselves to mercy of Polish-Lithuanian Duke. Rigas' defenders disagree strongly and steal the ceremonial Key of Riga. Will they succeed in their fight against all odds? Will three Latvian musketeers have their happily ever after?