Yesterday's Son (Yesterday Saga, 1) Star Trek Paperback Book. This Star Trek adventure was published in August 1983. Yesterday's Son (Yesterday Saga, 1) was authored by A. C. Crispin. Rest assured that this vintage paperback book may show signs of wear. Still, the copy you receive will be in excellent or better condition than the one in the image. I have multiple copies of each book and make every effort to represent the actual book accurately. You can trust that I stand behind my products with a no-questions-asked return policy.

Here is what is on the back cover. 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 Sarpeidon, 5,000 years ago, Spock knew a beautiful, primitive woman. Now he has gone back to meet his son! Give GoFigment a chance. As a dedicated Star Trek collector, I only sell items that meet my personal collection standards.