For the first six years of her life, Sarah Harris was a happy and popular little girl. Until she became the target of a dangerous but invisible enemy - and her life became a living hell. Before long she was suspended from school, alienated from her friends, and terrified of herself.

For her mother, Lyndsey, it was a life beyond her worst nightmares. The daughter she loved so much seemed to have transformed overnight into a child she was almost scared of. Her little girl was doing the unthinkable: stealing razor blades, attempting to poison her friends, even accusing her parents of sexual abuse.

Soon Lyndsey's marriage was on the verge of collapse, social services stepped in, and Lyndsey was fighting to keep her family together - and to save her daughter's sanity. But worse was to come as Lyndsey discovered her family had been victims of the most hurtful betrayal of all...