How does Nora plan to prevent Krogstad from reading the letter in A Doll's House?
Nora is haunted by her desperate actions of the past; ironically, these were actions she took to save the life of her husband. She borrowed money so that her husband's health could be restored in a warmer climate; more seriously, she forged the name of her father on the loan. Now, because her husband has dismissed Krogstad from his bank, the man writes a letter to Torvald in which he exposes his loan to Nora, who is guilty of having forged her husband's signature, and thus issues an ultimatum to Torvald that he be restored to his position at the bank.
Desperate, Nora considers suicide so that Krogstad cannot blackmail her husband. Or, she hopes to find a way to prevent the letter from getting into her husband's hands. In Act 2, Nora learns that Krogstad has placed the letter in her husband's mailbox, so she speaks with Mrs. Linde, who reacts by saying that somehow Krogstad must ask for his letter back. Then, she hurries through the door and departs, but not before urging Nora to go in to Torvald and speak with him. In the meantime, Mrs. Linde meets with Krogstad and informs him that it is his job that she has been given, but since they were once young lovers, she suggests they marry and he can have the position again.
KROGSTAD. Do you ...know what people think of me around here?
MRS. LINDE. A little while ago you sounded as if you thought that together with me you might have become a different person.
KROGSTAD. I'm sure of it.
MRS. LINDE. Couldn't that still be?
In the meantime, Nora seeks to delay her husband from looking at his mail by dancing the tarantella in her seductive Italian costume. But, her attempts fail as Mrs. Linde decides that Helmer must learn the "whole truth."