Agatha Christie Crime Collection:Murder of the Orient Express; Death in the Clouds; Why didn't they ask Evans?

Name: Agatha Christie Crime Collection:Murder of the Orient Express; Death in the Clouds; Why didn't they ask Evans?
Author: /author/%E9%98%BF%E5%8A%A0%E8%8E%8E%C2%B7%E5%85%8B%E9%87%8C%E6%96%AF%E8%92%82_(%E6%97%A0%E4%BA%BA%E7%94%9F%E8%BF%98)