FIRSTLY, WTF. 
 SECONDLY, I MANAGED TO GUESS THIS ONE TOWARDS THE END BUT ONLY IN A FIT OF FRUSTRATION & BECAUSE POIROT WAS STARTING TO LAY OUT THE FACTS. 
 I love that Poirot just wants to retire to the country, comb his mustaches and grow vegetables but is terrible at living the simple life & inevitably gets bothered by murderers. Also, Agatha Christie writes the DREAMIEST female characters, these past few days of obsessive reading has been like meeting a conga line of beautiful icy brunettes.