Ask a Policeman (novel)
Ask a Policeman is a 1955 detective novel by E.C.R. Lorac, the pen name of the British writer Edith Caroline Rivett. It is the forty first in her long-running series featuring Chief Inspector MacDonald of Scotland Yard. Published by the Collins Crime Club, the title references the popular music hall song Ask a Policeman. Synopsis
An elderly lady, a leftover from the Edwardian era, reports the disappearance of her nephew, a journalist. What seems at first a routine case quickly becomes a hunt for a murderer when the police investigate his last known address, a large rambling house in St John's Wood. Efforts to discover the truth are further hampered by the death or disappearance of several witnesses. References

Bibliography
 Cooper, John & Pike, B.A. Artists in Crime: An Illustrated Survey of Crime Fiction First Edition Dustwrappers, 1920-1970. Scolar Press, 1995. Hubin, Allen J. Crime Fiction, 1749-1980: A Comprehensive Bibliography. Garland Publishing, 1984. Nichols, Victoria & Thompson, Susan. Silk Stalkings: More Women Write of Murder. Scarecrow Press, 1998. Reilly, John M. Twentieth Century Crime & Mystery Writers. Springer, 2015. 1955 British novels
British mystery novels
Novels by E.C.R. Lorac
Novels set in London
British detective novels
Collins Crime Club books