Elephants Can Remember (Poirot)

Hercule Poirot is determined to solve an old husband and wife double murder that is still an open verdict???Hercule Poirot stood on the cliff-top. Here, many years earlier, there had been a tragic accident. This was followed by the grisly discovery of two more bodies ??? a husband and wife ??? shot dead.But who had killed whom? Was it a suicide pact? A crime of passion? Or cold-blooded murder? Poirot delves back into the past and discovers that ???old sin leave long shadows??.