Tarheel reader is a site that has many books on 100s of topic. Simply type in your topic, click any rating, then click search and books will populate below.
For Sherlock Center for Adapted books, these are published books that have been adapted. Books will either be Powerpoint and/or in PDF format. Scroll down a bit on the page till you see the search button. Click and type in the title of the book or even a word from the title and books will start to populate below. Click on the format you prefer or check out both.