Alex, if you had a son who told you that he liked his new flat because it was built on the site of 10 Rillington Place, what would you think?' 'Hillary, I wish you'd get to the point, ' I said as gently as I could manage. She was ruffled but not distracted. 'If a son of yours said that, would you think he was the Notting Hill killer . . . ?' Alex Tanner, part-time private eye, has given little thought to the serial killer stalking the streets of Notting Hill - except to the effect he may have on house prices. But then a wealthy widow hands her a parcel marked DESTROY UNOPENED . . . The parcel - given to Hilary Lucas following her husband's death - contains anonymous love letters, written over many years. Not surprisingly, Hilary wants Alex to reveal the mystery lover's identity . . . Especially when the letters suggest that the woman is the mother of the Notting Hill killer . . .