'Spotlight on Sin' was first published by Croydon in 1952 while 'Backwoods Shack' was first published under Whittington's pseudonym of Hallam Whitney by Carnival Books in 1954. This pairing from Lancer (72-631) is undated but, according to Mysteryfile, is from 1962. Cover art is uncredited, though there are two initials at bottom right (AH or AW?)