Jussi Vares becomes enamored with a stunning brunette, only to experience a tragic loss. After a brief romance with Sole, her lifeless body is discovered in a bird-watching tower. The investigation hits a dead end until Vares takes on the challenge of unraveling the mystery behind a series of chaotic denunciation letters. As the letters slowly unveil their secrets, a series of events unfold. A hitman named Stahanov receives a new mission, and Sole’s brother, upon discovering his wife with another man, embarks on a destructive spree, accompanied by a black cat. Ultimately, the trail of clues points to a familiar figure, leading to more inevitable deaths.