Black Book Detective Magazine
Black Book Detective Magazine was a fairly average pulp until it introduced the character of The Black Bat crimefighter in the July 1939 issue. He featured in about 60% of the magazine's issues and was directly responsible for the magazine surviving into the early 1950s, long after most detective pulps.
There was at least 1 issue of a Canadian reprint edition, and at least 5 issues of a British reprint edition.
BIG TARGET—ROGER FULLER
When a millionaire playboy disappears overboard from his yacht, it's time to see just who slipped up—and where.
THUBWAY THAM’S DEED OF MERCY—JOHNSTON MCCULLEY
A famous character returns in this, the first of a new series!
THE PROPHECY—HUGH B. CAVE