Brian Blackwell was the son every parent dreams of having. Charming, confidentand extremely clever: straight A grades at A-level meant he was about to embark on a medicine degree. But beneath all of the effortless success, was another story: Brian was gripped by a personality disorder, which made him obsessed with fantasies of power and brilliance. So when the 19-year-old student treated his girlfriend to a holiday of a lifetime in the US, with lobster, truffles and champagne, and a five-star hotel overlooking Central Park,suspicions began to be aroused. How had he found £30,000 to pay for the holiday? And where were his mother and father?