Frankenstein cannot forgive the creature for the death of his brother and Justine; he refuses to build the female companion. In desperation and rage, the creature promises to make his creator as miserable as himself. In his vengence, the creature murders Frankenstein's friends and family one by one, including his beloved cousin Elizabeth (who he married; 19th-century writers apparently weren't too bothered by incest; Wuthering Heights featured inter-cousin romance as well).