Third Girl — Agatha Christie

From her tousled appearance to her perplexed stare, there was so much about the young girl that struck Hercule Poirot as peculiar. But it was her vague confession to a possible murder she's not even sure she committed that really threw the Belgian detective for a loop. What's more, the odd bird has suddenly gone missing. Where to? No one knows. Why? No one cares. So what's her secret? No one's talking. But Poirot suspects it's going to be a killer...