Chepstow Castle, Gloucestershire.
A woman makes a gruesome discovery whilst out walking her dog.
The body of a teenage girl has been washed up on the banks of the River Wye, after weeks spent decomposing in the water.
But this is no suicide.
Bruising to the throat and legs indicates that the girl, Alison Watts, was dead before she reached the water.
For Superintendent Lambert and Sergeant Hook, an unsolved missing person’s case has just become a murder.
As Lambert and Hook delve deeper into the murky depths of the local community, they uncover shocking secrets about Alison Watts.
The local papers had portrayed her as the picture of innocence...