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With the help of the Vulcan leader T'Pau, Spock gets permission to use the Guardian of Forever, a portal through time constructed by a long-vanished race, to venture into the past. On another trip into history, on the planet Sarpeidon, Spock had loved a woman who could not return with him to the future, and now Spock wishes to see the son she bore him, 5,000 years earlier. But a Romulan attack on the Guardian's planet could interfere, unless the "EnterpriseTM can keep the Guardian out of their hands.

Yesterday Son 1985, Pocket Books

ISBN-13: 9780671605506

Mass-market paperback

Yesterday Son 1983, Pocket Books

ISBN-13: 9780671473150

Mass-market paperback