Vicious Circle (S04E02)

Whom would you consider to be the more dangerous? Rex Tobin, the young thief who breaks into Mrs. Grady's flat to rob her? Or dear little old Mrs. Grady herself, who, when Tobin falls and hurts himself, bandages his ankle, makes him tea, and promises to let him go if he will behave himself in future? He might be making all the right noises but she has all the right moves. (Prime Video)