Poirot e o Mistério da Arca Espanhola & Outras Histórias

Her plots always seem so tightly woven, but I wonder what her creative process was like when designing these surprises. Did she plan every twist in advance or discover them as she wrote?

Some stories felt brisk while others took their time building suspense. Was this variation intentional to keep readers on their toes?

I love trying to solve the mysteries, but sometimes I felt like I was missing key details. Do you think Christie wanted us to catch the culprit or just enjoy the ride?