"The Freak Show Murders"

 A classic tale with a decent cover.  The cover really seems to be from the novel itself with the lightweight statue being carried by the costumed villain.  I like it.

In 1945 it was used as the basis for a story in Shadow Comics titled "The Shadow Uncovers The Harlequin".

Next up was DC Comics 2nd issue by M. W. Kaluta in 1974.  The Shadow was back, baby!

In 1978 it was one of two tales in Double Day Crime Club's hardcover reprint.  Can't tell you how many times I checked that one out of the public library.