The Romulans attack the planet Gateway, where Federation scientists are studying the Guardian of Forever -- the mysterious portal to the past.
The Starship 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. Now he has gone back to meet his son!
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Review: Yesterday's Son (Star Trek: The Original Series #11)User Review - Kati - Goodreads
I usually don't like original characters in tie-in novels but Zar was amazing. Actually, he was so amazing that if there was a book just about him and his adventures, I would read it! But the ending ... Read full review
Review: Yesterday's Son (Star Trek: The Original Series #11)User Review - Aaron Scott - Goodreads
While the original five year mission only lasted three years on our TV sets, this left a lot of time unaccounted for that could be added to with novels and comic books. A really nice swift, light read ... Read full review