Go to Barnes & Noble tomorrow and just try to find Treason without asking for assistance. I’m serious – I dare you (and please post your findings).
Maybe your bookstore sold most of their copies already?
It's probably not any grand conspiracy - those people are trying to sell books - that's how they make their living.
Of course, if they don't realize Ann's book is going to be popular, a bunch of people going in asking for it ought to give them a 'heads up' - and I'd bet the book will begin to be more prominently displayed.
No -- I found a special stand of only "Treason". The B&N store in Toledo, Ohio has at least 25 copies -- however, the stand on which all 25 copies sits is hidden from the rest of the best sellers. No excuse for this...