I was a kid, excited about it all right, when the first Star Trek novel came out, Blish's Spock Must Die! My notes on a rereading:
Blish, James. Spock Must Die! Published 1970. Read again 24-25 July 2015.
Another television tie-in: James Blish's Spock Must Die! from 1970 (Wikipedia says February 1970), which I'd have read as soon as I could get my hands on it. It appeared in 1970, so I will assume I read it then, 45 years ago. I don't remember when or how I parted company with my copy. So far it seems faithful to Star Trek and to owe something to Algis Budrys's haunting Rogue Moon, one of the sf novels/novellas that has most impressed me.
25 July: Having finished the novel, I’ll say the Budrys connection is even more pronounced, since part of the story’s resolution is the telepathic or “telempathic” bond between the original and the replicate – a key element of “Rogue Moon.”
Blish seems to have set himself to write a short novel that would be completely acceptable to Star Trek fans as a fast-paced space opera-type adventure featuring their favorite characters (although if anyone was a Chekov fan, that reader might be disappointed, and a bit in which Lt. Uhura expresses the hope that someone whom she may be tutoring in a language will be “‘cute’” didn’t ring true) – and to write a book that would be tolerable to science fiction fans – so there’s more technical stuff than you’d ever get in a television episode. There’s a struggle between the two Spocks in a realm of seething illusions, with Kirk wishing he could shoot the bad Spock with his phaser but unable to do so, that was like something out of the series. The story ends with the Organians quarantining the entire Klingon Empire.