Elephants Can Remember

Hercules Poirot stood on the cliff overlooking the rocks below and the sea breaking against them. Here, where he stood, the bodies of a husband and wife had been found. Here, three weeks before that, a woman had walked in her sleep and fallen to death.

Why had these things happened?

'A classic example of the ingenious three-card trick that she has been playing on us for so many years'
SUNDAY EXPRESS

'Splendid...she tells us all we want to know and nothing that is irrelevant'
THE TIMES