Pekka ja Pätkä salapoliiseina

At Justiina's insistence, Pekka and Pätkä are looking for work again and end up starting a detective agency. The first assignment takes the duo on a cruise on Lake Saimaa. Traveling on the same ship are representative Johannes Kulo and his daughter Maija, as well as the lumberjack Jussi, who gets caught up in the duo's misadventures.

• Toivo KärkiOriginal Music Composer
• Reino HelismaaWriter
• Armand LohikoskiWriter
• Armand LohikoskiDirector

• Esa PakarinenPekka Puupää
• Masa NiemiPätkä
• Anja HatakkaMaija Kulo
• Ami LovénJussi Leino
• Siiri AngerkoskiJustiina Puupää
• Veikko LinnaJohannes Kulo
• Eino KaipainenLeino (uncredited)
• Juhani KumpulainenViljo Leino (uncredited)
• Tauno SöderRainer Strand (uncredited)
• Armas JokioPikkarainen (uncredited)
• Lasse SaxelinLasse (uncredited)
• Raimo LehtoTolvanen (uncredited)