While treating a policewoman for smoking, hypnotherapist Michael Strother has a telepathic vision of a young girl floating beneath the surface of a stream. The escaped victim of a ritualistic serial killer, the girl has become mute, and Michael is called upon by Scotland Yard to unlock the secrets she holds in order to catch a man who believes he has discovered the key to immortality.

Set in the fictional village of "Ogw" in the valleys of south-east Wales. After her father Jack suffers a stroke Annie Mary Pugh is forced to take care of him but uses the circumstances to emancipate herself and find the courage to sing once again.

A former nun turned criminal profiler is called in to investigate the horrific ritualistic murders of two middle aged women. Her unorthodox approach means that she has to deal not only with solving a murder but also winning the trust of her sceptical colleagues.