Agatha Christie. Rhodes triangle (№ 256272)

- You could warn the victim, continued Pamela.
"Sometimes," said Hercule Poirot, to warn was useless.
- You could warn the killer, slowly said Pamela, giving him to understand that you are aware of his intentions...
Poirot nodded approvingly.
- Yes, this plan is better. But we should not forget about the most important defect of any criminal.
And what is this Vice?
- Arrogance! Every criminal is confident that his sort of crime can reveal.