Heroically brave and mad, prodigious in his industry and appetites, Norman Mailer was an altogether excessive figure. Since his death in 2007 there have been several biographies, but this is the big one — big enough to accommodate a triple or quadruple life, let alone a double. It is also the official one, written at Mailer’s request by J. Michael Lennon, his friend, collaborator and literary executor, who is respectful and affectionate but not hagiographic.