The Mirrorball Man wrote:
So, where should we start? What is the best standalone TOS novel ever published?
The best book to ever come out as a Star Trek book is far and away "The Final Reflection".
But that's not really strictly speaking a TOS novel(as it doesn't heavily feature the TOS crew). As for one that does, that's rather harder. I'd probably go with "Doctor's Orders", although there's a lot of competition. "Memory Prime", "Spock's World", "First Frontier", "Time for Yesterday", and a few others are all contenders for me.