Yesterday's Son is a science fiction novel by American writer 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 novelizations to make the New York Times Bestseller List.
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original title: Yesterday's Son
date of publication: 1983
genre: science fiction novel
narrative location: Gateway
characters: James T. Kirk, Spock, Montgomery Scott, Hikaru Sulu, Pavel Chekov, Uhura, Guardian of Forever, T'Pau
follows: Web of the Romulans
followed by: Mutiny on the Enterprise