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Henry Beam Piper (1904 - 1964) was an American science fiction author. He wrote many short stories and several novels. He is best known for his extensive Terro-Human Future History series of stories and a shorter series of "Paratime" alternate history tales.
The Paratime Police had a real headache this time. Tracing one man in a population of millions is easy -- compared to finding one gang hiding out on one of billions of probability time-lines! This classic short novel originally appeared as a two-part serial in "Astounding Science Fiction Magazine" in 1955.