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Orion Arm is written by Julian May and published by HarperCollins UK. It's available with International Standard Book Number or ISBN identification 0007379250 (ISBN 10) and 9780007379255 (ISBN 13).
After Helly Spur's attempts to break the Galapharma conspiracy with the Haluk against the Human Worlds, this carries on where "Perseus Spur" left off. Helly and his companions attempt to capture a crucial witness to the conspiracy, who has taken refuge on a hostile planet.