Is Desmond in any of these things though? That's the real important question that needs to be answered. @JBear knows how important this is.My recommendation, if you're playing catch-up:
1. Buy the first 5 issues of Steeple (AKA volume 1) and then read the rest up to Christmas with Clovis online
2. Buy Wicked Things (which is effectively Solver book zero) and then read Circus Windows online
3. Enjoy the wonderful Author Unknown crossover event
4. Finish catching up with Steeple and Solver at your leisure
Steeple and Solver are both excellent IMO, among my favorite stuff that Allison has ever done. Confusingly, both series start with work that is (for the moment) not available for free on any of John's multitudinous websites.