Yesterday's Son - Star Trek:8 Author:A. C. Crispin The Romulans attack the planet Gateway, where Federation scientists are studying the Guardian of Forever - the mysterious portal to the past. — The Enterprise must protect the Guardian - or destroy it. But Spock has already used the portal to journey to the past. On the planet Sarpedion, 5,000 years ago Spock knew a beautiful, primitive woman. ... more » Now she has gone to meet his son!« less