Why are we fascinated by serial killers? They're everywhere; on the news, in crime fiction, on television and in our daily lives. We are obsessed by those who take human life and show no remorse. We can't get enough of them. Writer Paul Pender talks about why they fascinate us, and his real-life encounters with Roy Fontaine, the so-called Monster Butler who brutally killed his victims and threatened to kill Pender too! His book The Butler Did It is now being developed as a TV series with Alan Cumming.