Krogstad is an employee at the bank at which Torvald is made manager. He leant Nora the money to take Torvald to Italy to recuperate. He has committed an "indiscretion" in the past involving a crime similar to Nora's - forging a signature on a document. Since then, he has struggled to regain and maintain his respectability in the eyes of society. His job at the bank is a major part of this respectability. So when Torvald, who sees Krogstad as irredeemably morally tainted, decides to give his job to Mrs Linde, he resorts to blackmailing Nora. Unless Nora persuades Torvald to keep Krogstad in his job (he later extends this to a promotion), he will tell Torvald about her loan and her forgery of her father's first, Krogstad appears to be a grasping and vindictive villain. But as soon as Mrs Linde tells him that she has always loved him and asks him to resume their relationship, he reveals himself as a more loving, joyful and merciful character. Mrs Linde, unlike Torvald, believes that Krogstad can change for the better, and indeed, from this point on, his life appears to be set on a positive course. He recants his threats to the Helmers and sends Nora's bond back to her, relinquishing his power over her. In effect, Krogstad's story is a testament to the redeeming power of love and challenges the notion held by Torvald that moral dissolution, like the Calvinist notion of 'original sin,' is permanently ingrained.