Elephants Can Remember

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’.