She often stayed at Brown's Hotel in London, & it's said that it inspired her mystery novel "At Bertram's Hotel"
The escape begins with a two night stay at Brown's Hotel in London which is the 
... Miss Marple as she unwinds the mystery surrounding the guests in their hotel, 
... a taste for mystery and intrigue, At Bertram's Hotel is a novel which not only... [DOC] [TLE] The Year of Agatha [PAR] She rushes to London to visit the only person who can help her: Hercule Poirot.