Twenty-one years ago, Dr Richard Carter and his wife Pamela were killed in what has become the most infamous double murder of the modern age.
Their ten year-old daughter – nicknamed the Angel of Death – spent eight years in a children’s secure unit and is living quietly under an assumed name with a family of her own.
Now, on the anniversary of the trial, a documentary team has tracked down her older sister, compelling her to break two decades of silence.
