[username]

His British 1950 collection Tales of Mystery and Revenge is rare, as is the 1969 Mayflower PB reprint. Neither made it to America. One story originally published in 1935, Serenade for Baboons, was reprinted in several books including Pan Book of Horror Stories, which was reprinted in America, but the other reprinted story, Bone Bead Necklace, was only reprinted in the British anthology Medley Macabre in 1966, which never made it to America. However, I found a story by Langley in the Saturday Evening Post from 1948 called Day of Vengeance: archive.org/details/the-saturday-evening-post-1948-04-10/
which seems to be the same story as Bone Bead Necklace. There doesn't seem to be any mention of this anywhere on the web, so I thought horror story fans would like to know, since it's a good tale and extremely hard to find under its later title.