A wealthy banking-house is unsettled when its long-absent heir returns from years abroad, bringing memories of a youthful forgery that led to his exile. Colleagues, family members, and a devoted cashier become entwined in questions of honor, suspicion, and legal peril as arrests, an inquest, and prison threaten reputations. Romantic entanglements and sacrifices complicate loyalties, while a portrait, clandestine journal entries, and journeys across country and continent propel a pursuit that uncovers hidden truths. The narrative alternates close third-person episodes with diary fragments and an epilogue that revisits consequences years later.