
December 1963 Dell paperback original
cover art by Ron Lesser
better image than previously posted

not the same Parker who wrote the Spenser books, though this one was a Robert B (for Bogardus) Parker, too
1951 Rinehart hardcover, this the 1952 Dell softcover released the next near
cover art by Robert Stanley
better image than previously posted

March 1948 issue ~ cover art by Rudolph Belarski

1929 Dutton hardcover
also published as The Bellmer Mystery in the UK in 1930
this the later 1949 Popular Library paperback, with repurposed art by Rudolph Belarski
better image than previously posted

repurposed from Spring 1949 issue of Mystery Book Magazine

pseudonym of Albert Leffingwell
1940 Dial hardcover – 1950 Popular Library reissue – cover art by Rudolph Belarski