A.C. Crispin

Time For Yesterday is a novel by A. C. Crispin set in the fictional Star Trek Universe. It is a sequel to Crispin's earlier novel, Yesterday's Son, and describes a second encounter between the crew of the USS Enterprise and Spock's son, Zar. The two books followed the original series episode "All Our Yesterdays", and …

Yesterday's Son is a novel by A. C. Crispin set in the fictional Star Trek Universe. It describes the events surrounding Spock's discovery that he has a son. Yesterday's Son and its sequel, Time for Yesterday, make up A. C. Crispin's Yesterday Saga. The book was the first Star Trek novel other than the movie …