Not like that Mademoiselle

Poirot looked at her sadly.  “Ah, mais c’est Anglais ça,” he murmured, “everything in black and white, everything clear cut and well defined.  But life, it is not like that, Mademoiselle.  There are things that are not yet, but which cast their shadow before.

– Agatha Christie, The Mystery of the Blue Train (1928)