six o’clock
`` What a monstrous idea ! _ I _ -- poison my dearest Emily ! '' `` I do not think '' -- Poirot watched him narrowly -- `` that you quite realize the unfavourable nature of your evidence at the inquest . Mr. Inglethorp , knowing what I have now told you , do you still refuse to say where you were at six o'clock on Monday afternoon ? '' With a groan , Alfred Inglethorp sank down again and buried his face in his hands . Poirot approached and stood over him . `` Speak ! ''