Nils Krogstad Timeline and Summary

Krogstad has a meeting with Torvald, where he's told he'll most likely be fired.
He blackmails Nora to get her to talk to Torvald on his behalf.
Krogstad gets fired anyway.
So he shows up for another blackmailing session.
He says he'll soon control the bank instead of Torvald.
Krogstad drops a letter in the mailbox detailing his demands to Torvald.
He reunites with Christine and has a major change of heart.
Krogstad sends a letter to the Helmers that releases them from his clutches.