Mrs. Searwood's Secret Weapon — Leonard Wibberley

Mrs. Searwood, a widow in wartime London, is certain that Hitler has a personal grudge against her, but her life takes a decidedly stranger twist when she finds companionship in a spirit, Chief White Feather, who has been passing the last 300 years educating himself at Britain's institutions of higher learning. Moving to a small village to get away from the bombs, Mrs. Searwood finds more adventure, and romance, than she would have ever guessed. Mrs. Searwood's Secret Weapon was first published in 1954.