Miss Marple: Nemesis (1987)

John Horsley: Professor Wanstead

Quotes 

• Professor Wanstead : Archdeacon, there's someone I'd like you to meet. There she is...

  [Gesturing in Miss Marple's direction] 

  Professor Wanstead : . Mr. Rafiel's bloodhound - his avenging angel. She looks so harmless, doesn't she? But her camouflage is perfect because she is partly just what she seems - a gossipy old village lady, but her logic is ruthless and her powers of synthesis formidable. And above all she never lets go.