This is a card I received from a friend in England last month. Greenway in Devon was Agatha Christie's house, which is now partof the National Trust.
The library showing the frieze painted by Lt. Marshall Lee of the U.S. Nacy in 1973.
I wrote about Greenway here. Can't you just picture Agatha pulling a book off one of those shelves and curling up on the sofa to read?