The monster lives for years in the wild, learning about life from a family of cottagers that he watches from his hovel.
William is murdered. Strangled in the woods.
Victor spots the creature and realizes that he was the one that killed William, "Could he be the murderer of my brother? No sooner did that idea cross my imagination than I became convinced of its truth" (p 70)
The creature demands that Victor create a companion for him and if he does not he will harm his family and friends.
There are many deaths...
Victor vow revenge on the creature. "Never will I give up my search until he or I perish." (p 212)