OK, it's not a great classic or anything, but taken on its own terms, it's highly enjoyable. The premise (gay liberal male gets involved with gay conservative male) is just a variation of the Carville/Matlin phenomenon, but Bram gives it the humor and odd twists which are required to keep your interest.
As for the second half, the so-called "mystery", readers would be well-advised to take that on Bram's terms, too; he's not really trying to make a big socially significant point, but he's not just settling for a frothy Robert Rodi-type novel, either. (No offense to Rodi, whose novels I always enjoy).
In some respects, Bram's style reminds me of Peter Cameron or Nick Hornby. These authors clearly care about their characters, but in a somewhat detached way which may not appeal to everyone.
Don't mistake this detachment for disinterest or lack of conviction; it's all there, it's just that Bram is evoking the era a bit more effectively than we may be comfortable acknowledging. No, the loose ends are not all neatly wrapped up at the end, but when does that ever happen in real life anyway?