Lansbury said she played the part of Marple "absolutely straight. I'm trying to get at the woman Agatha Christie created: an Edwardian maiden lady imbued with great humanity and a mind of tremendous breadth. She's very exactly described in the books as tall, pale-complexioned, with twinkling blue eyes and white hair - not a fat galumph of a creature at all. I base my performance on that. Also on the fact that she has tremendous alertness and curiosity allied to a great appetite for murder."