Yesterday's Son
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 Sarpeidon, 5000 years ago, Spock knew a beautiful, primitive woman. Now he has gone to meet his son!
Star Trek fiction, Fiction, Space ships, Interplanetary voyages, Science fiction
A. C. Crispin
Ann Carol Crispin (April 5, 1950 – September 6, 2013) was an American science fiction writer, the author of twenty-three published novels. She wrote several Star Trek and Star Wars novelizations and created an original science fiction series called StarBridge.