Nora's forged loan and the slammed door
Nora Helmer secretly borrowed money from Krogstad to fund a recuperative trip that saved her husband Torvald's life, forging her dying father's signature as guarantor, and has spent years quietly repaying it. When Torvald moves to sack Krogstad from the bank, Krogstad drops a letter exposing the forgery into the Helmers' locked letter box; Torvald reads it, denounces Nora as unfit to raise their children, then forgives her the moment a second letter removes the threat of scandal. Seeing that he never meant to take the blame on himself, Nora tells him she has lived as a doll first to her father and then to him, and walks out, closing the door behind her.