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On the planet Sarpedion, 5000 years ago, Spock knew a beautiful, primitive woman. When the Enterprise is called upon to protect the "Guardian of Forever" - the mysterious portal to the past - Spock uses it to journey to the past. And to discover his own son.

Yesterday's Son 1988, Titan Books Ltd, London

ISBN-13: 9781852860615

New edition

Mass-market paperback

Yesterday's Son 1984, Gregg Press

ISBN-13: 9780839828303

Unknown binding

Yesterday's Son 1984, Firecrest Pub., Bath

ISBN-13: 9780859975605