It's not often someone says you've saved their life. Especially if you've never met them. So I was surprised to receive a long letter from a woman in South Africa saying I'd done just that. 'I have kept your article in Hello magazine ... dating back to 2003!' she says, 'and I want to thank you so much because you saved my life.'

    The article was on controlling psychopaths ... the notorious serial killers Fred and Rose West, who sexually tortured and murdered at least 16 young women, burying them in their Gloucester, UK, house and garden -- even including Fred West's own daughter. 

    For thirteen years, the letter said, she was married to a man whom she discovered to be a liar, with no morals, who manipulated her. ‘I knew he had no feelings,’ she says, ‘but he was so clever hiding it …  he could convince anyone of anything … he thought he was above the law … he had to control everything, family, friends, relations, me. 'I knew there was something terribly wrong but I did not know what.’