Bats Fly at Night x 6

1942 Morrow hardcover

7th with private eyes Bertha Cool and Donald Lam

1948 Dell reissue – cover art by Gerald Gregg

better image than previously posed

1953 Dell reissue – cover art by Robert Stanley

cover art by Robert McGinnis

1960 Dell reissue

1963 Dell reissue – cover art by Ron Lesser

1966 Dell reissue – cover art by Robert Abbett