Vast majority of Agatha Christie mysteries (in book form) can be solved by clues up to the big reveal at the end. She is the master of whoddunit for a good rea

Vast majority of Agatha Christie mysteries (in book form) can be solved by clues up to the big reveal at the end. She is the master of whoddunit for a good reason. Sometimes she wrote the clues in after the story was written, but the clues are there. Murder of Roger Akroyd is probably the canonical example of this when you go back and reread it. PS I am excluding some of her adventure and later novels from this as indeed her late stage work suffered from her diminished abilities.