Dark Mirror is my least favorite of Duane's Star Trek novels. It's not bad, and there are far worse novels you could have started with, but if you're interested in the Star Trek EU, I can suggest some that better illustrate what the novels do best (expanding the ST universe, OCs, and patching canon inconsistencies).
(I'm a huge ST novel fan, so I get excited when I see people reading them. *g*)
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(I'm a huge ST novel fan, so I get excited when I see people reading them. *g*)