Detective Peter Porteous is called to Cranwell Lake where the body of a teenager has been discovered. After trawling through the missing persons files, he comes to the conclusion that the corpse is Michael Grey, an enigmatic and secretive young man who was reported missing by his foster parents in 1972. The news report that a body has been found leaves prison officer Hannah Morton in shock. Michael had been her boyfriend, and she had been with him the night he disappeared. And now the discovery is bringing back dreaded and long buried memories from her past...