It came in a plain brown wrapper, no return address – a tape recording of a horrifying, soul-lacerating scream, followed by the sound of a childlike voice delivering the enigmatic and haunting message:'Bad love. Bad love. Don't give me the bad love…'For child psychologist Dr Alex Delaware, the chant, repeated over and over like a twisted nursery rhyme, is the first intimation that he is about to enter a living nightmare. Others soon follow: disquieting laughter echoing over a phone line that suddenly goes dead, a chilling trespass outside his home, a sickening act of vandalism. A carefully orchestrated campaign of vague threats and intimidation rapidly builds to a crescendo as harassment turns to terror, mischief to madness.Searching his memory for the phrase 'bad love', Alex recalls...