Police officer Palmu investigates the murder of a journalist in Helsinki, Finland. The investigation takes him to different locations including Moscow, Soviet Union. He uncovers a conspiracy involving wire-tapping, bugging, and tax evasion. With the help of a television reporter, Palmu unravels the truth behind the murder and exposes the culprits.

Inspector Palmu is called to investigate a murder in Helsinki, Finland. With multiple suspects and a complex case, Palmu must navigate the city's urban setting to find the truth. As he interviews witnesses, including a mailman, a preacher, and a racing driver, Palmu uncovers a web of lies, leading him closer to the murderer. With twists and turns, the movie explores themes of guilt, inheritance, and the complexities of human relationships.

Inspector Palmu gets to solve a new case, when a wealthy real estate millionaire connected to Germany is murdered in Kaivopuisto, middle of post-war Helsinki. The murder is only beginning for the events that will shake the city even more violently than Soviet bombers during the war.

Inspector Palmu investigates a murder in a country estate, uncovering a mystery involving a youth gang and ex-military individuals. As he delves deeper into the case, he discovers shocking secrets and must unravel the truth behind the whodunnit. Set in Finland during World War II.

Inspector Palmu is called to solve the murder of a wealthy tycoon. As he delves deeper into the case, he uncovers a web of secrets and intrigue among the suspects. With a stolen manuscript and an intoxicated witness, the inspector must navigate through a series of false confessions and feigned faintings to uncover the truth. Set in Helsinki, Finland, this first film in the series showcases Inspector Palmu's brilliant detective skills and eccentric personality.