He laughs best who laughs at the end.
Desperate ills need desperate remedies.
Who are you? You don't belong to the police?' 'I am better than the police,' said Poirot. He said it without conscious arrogance. It was, to him, a simple statement of fact.
Nurses - nurses, you'm all the same. Full of cheerfulness over other people's troubles.
To keep something wild is far more difficult than to preserve it.
When the sea goes down, there will come from the mainland boats and men. And they will find ten dead bodies and an unsolved problem on Indian Island.