Crossword Clue:

Downfall in many an Agatha Christie novel

AnswerCrossword Clue
POISONDownfall in many an Agatha Christie novel
NILESetting for an Agatha Christie novel
CYANIDEPoison in the Agatha Christie novel "Remembered Death"
DEATHWord in many Agatha Christie titles
ARSENICElement in many Agatha Christie books
NILERiver in an Agatha Christie title
NILEWord in an Agatha Christie title
NONEAmount in an Agatha Christie title