Peter Saxon - Satan's Child (Mayflower edition)

Published in the U.K. by Mayflower in 1967. Peter Saxon was originally a pseudonym of W. Howard Baker but it became a house name when Baker took over the editorial reins of the Sexton Blake line. At least five other authors published as Peter Saxon - Wilfred McNeilly, Martin Thomas, Rex Dolphin, Stephen D. Frances and Ross Richards - this particular novel is by Wilfred McNeilly. Cover art is not credited.