A skilled private detective unravels a complex case after a woman is accused of killing her husband without witnesses. Investigations reveal bank-note evidence, suspicious financial irregularities at a manufacturing firm, and mysterious absences among acquaintances, drawing the sleuth into forgery, hidden motives, and layered deceptions. The narrative follows methodical clue-gathering, interviews, and clandestine inquiry as domestic tensions, secrets, and false leads converge toward a courtroom climax and the detective's efforts to expose the true circumstances. Pacing alternates between procedural detail and tense personal encounters, emphasizing deduction, the burden of secrets, and the search for corroborating evidence.