Yesterday’s Son Audiobook (Free)

The Romulans attack the earth Gateway, where Federation scientists are studying the Guardian of Forever — the mysterious portal to the past.

The Starship Business™ must safeguard the Guardian — or eliminate it. But Spock has already used the portal to trip to the past. On the planet Sarpedion, 5,000 years ago, Spock knew a beautiful, primitive woman. Today he has gone back to meet his son!