William P. McGivern, a popular and prolific science fiction writer in the 1940s and 1950s (under his own name as well as the pseudonyms Gerald Vance and P.F. Costello), later achieved fame as a noir and hardboiled mystery author of such classics as "The Big Heat." The First William P. McGivern Science Fiction Megapack collects 25 of his early science fiction stories, including:
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