Poirot took a quick step forwards. “You should not do that. Mademoiselle–“ The young woman started nervously at the sound of his voice. The revolver slipped through her fingers. She was standing by the edge of the pool and the revolver fell with a splash into the water.
Her mouth opened and she uttered an “Oh” of consternation, turning her head to look at Poirot apologetically. “What a fool I am,” she said. “I’m sorry.”
Just for a moment an odd restlessness came to him – a rippling of his previous placidity. He felt, There’s something – something I haven’t got – something I want – I want – I want…. The golden green light, the softness in the air – with them came a quickened pulse, a stirring of the blood, a sudden impatience. A girl came through the trees toward him – a girl with pale, gleaming hair and a rose-flushed skin. He thought, How beautiful – how unutterably beautiful. Something gripped him; he stood quite still, as though frozen into immobility. The world, he felt, was spinning, was topsy-turvy, was suddenly and impossibly and gloriously crazy! The girl stopped suddenly, then she came on. She came up to him where he stood, dumb and absurdly fish-like, his mouth open.
Whether the key word to the situation is the phrase “Why didn’t they ask Evans?” or not doesn’t seem to me to matter much since you’ve no clue to who Evans is or as to what he was to have been asked. Let’s put it that the murderer or murderers assumed that Jones was in possession of some knowledge, whether he knew it himself or not, which was dangerous to them.
‘You see, you’ve asked the same question that Carstairs asked. Why didn’t they ask the parlourmaid? Why didn’t they ask Evans?’ ‘Ohi Bobby, we’re getting there at last” ‘The same thing must have struck Carstairs. He was nosing round, just as we were, looking for something fishy – and this point struck him just as it struck us. And, moreover, I believe he came to Wales for that reason.’