Night's Black Agents

No book-club edition of the Arkham volume is documented, and Arkham did not reprint it. The expansions are the real traps: the Berkley paperback of 1978 adds "The Girl with the Hungry Eyes" and "A Bit of the Dark World," and the Gregg Press hardcover of 1980 — sometimes called the definitive version — adds a Richard Gid Powers foreword on top of the Berkley contents. A copy containing either added story is not the Arkham first, whatever its binding suggests. Facsimile jackets for Arkham House titles are commercially available.