What is the theme in Cirque Du Freak #7: Hunters of the Dusk: Book 7 in the Saga of Darren Shan by Darren Shan?

Coming of age is a major theme in the book. Darren is a young boy who has almost accidentally become a Vampire Prince. At the beginning of the book, Darren is still a boy in body and in much of his thinking and behavior. By the end of the book he has a teenager body and has matured in his thinking. He has learned to accept responsibility for his mistakes.