Read the novels for Star Trek 3 and 4. It goes into storylines that weren’t in the movie. Such as Spock got Saavik pregnant when she helped him with the Pan farr on the Genesis planet. And Sulu seeing his ancestors on earth when they were in San Francisco.
My bad! I did not know you were a huge Trek fan! Absolutely please let me know your suggestions. I love me some Trek but I have not at all explored books yet.
Also, thank you everyone for your suggestions. I am going to start picking up some books.