A likeness in stone

"Twenty years after she disappeared, the body of a woman is found in a water reservoir, confirming what British inspector Bill Driver thought all along, that she was murdered by her lover. But can he prove it?"
"A diver discovers a corpse who has been missng for many years. She was murdered when she was an undergraduate at Somerville College, and three of her closest friends colluded to protect the identity of the killer."@en
"When divers discover a woman's corpse in a house that has long been submerged by a reservoir, the retired detective who first investigated the victim's disappearance has his worst suspicions confirmed: Helena Warner, an undergraduate at Somerville College, Oxford, was murdered, and three of her closest friends colluded to protect the identity of the killer. With Bill Driver back on his trail, the killer strikes again, and Driver must try to understand the strange, dark ties that bind Helena's three friends together in silence if he is to prevent further deaths.--"
"Een gepensioneerde Engelse detective raakt na het vinden van het lijk van een twintig jaar eerder verdwenen studente opnieuw betrokken bij een oude moordzaak."