Constable Guard Thyself
Constable Guard Thyself is a 1934 mystery detective novel by the British writer Henry Wade. It was the third in a series of seven novels featuring the character of Chief Inspector Poole, although it was preceded by  the 1933 short story collection Policeman's Lot in which seven of the twelve stories had featured Poole. After his more experimental novel Mist on the Saltings Wade returned to the traditional detective model. Synopsis
When the Chief Constable of the rural county of Brodshire is found shot to death in his office, his acting replacement reluctantly calls in the assistance of Scotland Yard. Inspector Poole arrives to head the investigation in the face of hostility from the local police, a number of whom figure as prime suspects for the killing. References

Bibliography
 Herbert, Rosemary. Whodunit? : A Who's Who in Crime & Mystery Writing. Oxford University Press, 2003. Magill, Frank Northen . Critical Survey of Mystery and Detective Fiction: Authors, Volume 4. Salem Press, 1988. Reilly, John M. Twentieth Century Crime & Mystery Writers. Springer, 2015. 1934 British novels
Novels by Henry Wade
British mystery novels
British thriller novels
British crime novels
British detective novels
Constable & Co. books
Novels set in England