Dang my writing group!
They told me I wasn't done. And then they gave me excellent advice on what was missing, curse them. And I thought I had tied up all those loose ends. They all agreed the resolution came much too fast.
Hmm. I have read that there needs to be a try/fail cycle repeated at least 3 times for the reader to feel satisfied. Guess that's true, because my protagonist got it on the first try and no one was satisfied.
Another point was the culmination of the internal struggle. I dealt with the overt struggle - addiction. But I forgot about the underlying struggle of him getting himself back. A reintegration of self seems to be needed. Now that's a great insight. (thanks Pat!)
So it looks like the tome may need to wait a bit while I rewrite the end of the mystery. It's important to me that it is complete and well done. Now if I could just clone myself and work on them simultaneously.