Hour Five: the word for London
Nudge. Each line is a fact about one of Mrs Christie's books. Look up any you do not know. The word is hidden in the answers, the way a crossword hides one.
Harder
Death on the Nile is set in Egypt. Miss Marple lives in St Mary Mead. Poirot is Belgian. Styles, in her first book, is in Essex. Mr Ackroyd's first name was Roger. Take the first letter of each.
The answer
The word is ember.
Egypt (Death on the Nile), Marple (St Mary Mead), Belgium (Poirot's country), Essex (The Mysterious Affair at Styles) and Roger (The Murder of Roger Ackroyd): their first letters spell EMBER.