Hercule Poirot is determined to solve an old husband & wife double murder that is still an open verdict... Hercule Poirot stood on the cliff-top. For here many years earlier there had been a tragic accident
- the broken body of a woman was discovered on the rocks at the foot of the cliff. This was followed by the grisly discovery of two more bodies
- a husband & 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 a crime committed 15 years earlier & discovers that when there is a distinct lack of physical evidence it's just as well that 'old sins leave long shadows'...