"I wanted to get revenge for the way she treated me," Kim Edwards told one psychiatrist. As the details of the cold and brutal killings of Elizabeth Edwards and her daughter Katie were read out in court, the facts seemed at odds with the slight and seemingly timid teenager sitting in the dock. Nottingham Crown Court heard how she and her boyfriend Lucas Markham, both aged 14 at the time, had plotted for days to cut their victims' throats as they slept at the family home in Spalding, Lincolnshire. A grudge Kim held against her mother - and her bitter resentment of her mother's close relationship with her sister - was the motivation for the murders, prosecutor Peter Joyce QC said. But it was not until jurors heard the details of a series of interviews Kim gave to police and psychiatrists that the depth of her hatred was revealed.