If an unused movie concept was going to be turned into a book, I'd be a lot more interested in the original Renaissance First Contact than I would be in this. The only problem with that one is that I'm not sure if it ever made it beyond a general idea.
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I'm also unclear if it ever got past an idea stage. Maybe there was a story outline, but I don't think there was a script. The whole idea of it -- the Borg in Renaissance Italy, laying siege to a castle, with Leonardo da Vinci (presumably Flint) -- is so off-concept that I can't believe they actually considered it. I can see this as a Doctor Who story -- Cybermen, Leonardo, the Renaissance, the whole nine yards -- but Star Trek? It's so weird I want to know what they were thinking.
I think about this time Jack Dann's The Memory Cathedral, a novel about da Vinci and Machiavelli, came out. It's really good, I remember really liking it.
I'd be curious about a book based on the aborted fourth Kelvin movie in which Kirk meets his dead father for some reason.
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Though Diane Carey used some of the concept for Ship of the Line (Picard consulting with Kirk on the holodeck), I'd like to see something done with Maurice Hurley's script for the seventh film. And if Braga and Moore's A versus D story ever got past outline stage, before it was abandoned for the Nexus story, I'd like to see that, too.