Ahem, "The Chimes At Midnight"...
In a word-wow, it was much better than I'd remembered. I enjoyed Thelin, he was a good, interesting character. (He was so close to Kirk, it makes you almost forget Spock isn't there).
It was certainly a darker AU counterpart to the TOS movie series, what with the Whale Probe succesfully ransacking earth, David being tortured, the Klingons assaulting earth, and the Genesis torpedo eventually being used as the very thing the Federation dreaded (a weapon of mass destruction).
Now I'd better go back to Day Of The Vipers.