What is the theme in Gertrude and Claudius by John Updike?

Although Updike has from time to time been charged with being a misogynist blessed with a graceful style by critics of various persuasions, the first characteristic one observes about this novel is the sequence in which the characters' names appear in the title. By contrast, Shakespeare's three plays, named after joint protagonists, consistently exhibit a patriarchal priority characteristic of his age (Romeo and Juliet, Troilus and Cressida, Antony and Cleopatra).,