Yesterday I read
Three Gold Crowns by Paul Ernest under the house name, "Kenneth Robeson"
It is the #14 book in the Avengers series from the 1940s.
Its a short pulp men's adventure story of pulp hero Richard Benson using the moniker The Avenger, along with his team, Justice, Inc., trying to undercover the mystery surrounding the death of an assistant of a man who is being blackmailed into giving up one million dollars.
What I found interesting is that in Justice, Inc. there are two black members and they aren't racial stereotypes.
Couldn't find a good picture of the cover but it is this without the border