The forged document is included in the second letter.
Torvald’s rejection of Nora when he read Krogstad’s first letter
closes off their relationship. In effect he dismissed her from
the human race, since he denies her the only roles permitted her those of wife and mother, thus ironically pushing her toward finding new ways to relate to society. When moments he later receives Krogstad’s second letter and restores her to her status as delicate possession she recognizes the he is once again trying to cut off her change to grow and become involved in the world.
In effect Torvald alienates Nora into leaving her home and her family.