She often stayed at Brown's Hotel in London, & it's said that it inspired her mystery novel "At Bertram's Hotel"
.... At Bertram's Hotel is by no means Dame Agatha's most fantastic novel... [DOC] [TLE] Amazon.com: Agatha Christie's Marple Season 3: Geraldine ... [PAR] Instead, she has been told to look for clues on a mystery bus tour, a trip Mr. 
Rafiel's ... Revisiting a glamorous London hotel that she remembers fondly from 
her ... including the atmosphere of danger beneath its highly polished veneer.