There are 12 books in Star Trek Series.
A 12-volume series of novelizations of Star Trek: The Original Series episodes written by James Blish and J.A. Lawrence and published by Bantam Books through the 1970s. The episode novelizations were rearranged and collected in a three volume set Star Trek: The Classic Episodes .
Other series related to Star Trek Series are Cities in Flight , After Such Knowledge , The Devil's Day and Star Trek: The Classic Episodes .