What forces drive a man to kill compulsively, as in the case of Jeffrey Dahmer, who has confessed to murdering seventeen young men? BRIAN MASTERS reports from Milwaukee on the private world of Jeffrey Dahmer. And in an unsettling real-life scenario akin to The Silence of the Lambs, he sought a key to the killer's psyche from Dennis Nilsen, now serving a life sentence off the coast of England for the murder of fifteen men in patterns remarkably similar to Dahmer's