Leslie Purnell Davies was born on October 20, 1914, in Crew, Cheshire, England, the son of Arthur Davies and Annie Sutton Davies. From 1930 to 1939, Davies worked as a dispensing pharmacist in Crewes. Educated at Manchester College of Science and Technology, University of Manchester, he qualified as an optometrist in 1939 (fellow, British Optical Society). On November 13, 1940, he married Winifred Tench.
During World War II, Davies was in the British army, serving with the Medical Corps in France and with the Eighth Army in North Africa and Italy. He achieved the rank of staff sergeant. Following the war, he spent two years as a freelance artist in Rome before returning to England. From 1946 to 1956, he was postmaster at West Heath, Birmingham. In 1956, he moved to Deganwy, North Wales, where he established a private practice in optometry and operated a gift shop. In 1975, he moved to the Canary Islands, Spain.
The author of more than 250 short stories published under at least ten pseudonyms, Davies used his own name when he published his first crime novel, The Paper Dolls (1964). It is a practice that he continued with each succeeding novel he published in the United States.