Many public libraries swithed from Overdrive to Libby, apparently written by the same authors as Overdrive. Unfortunately, Libby suffers from such reduced functionality (search and filter functions) it has been rendered useless. My reading lists are quite broad, but unless the author or title is on some commercial "Top 100 Bestsellers" list, it doesn't even appear, whether it's available or not. Please, go back to Overdrive, or else get a better search and checkout engine.