The answer is:
Krogstad tries to blackmail Nora into getting Helmer to keep him at the bank by exposing her forgery.
In "A Doll's House," by Henrik Ibsen, Krogstad has lent money to Nora illegally and secretly to pay for her husband's health treatment in Italy. As a consequence, when Torvald wishes to dismiss Krogstad from his job at the bank, the latter demands to Nora that she persuades her husband so that he can keep his job, and threatens to write a letter to Torvald revealing his wife's fraud.
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