OpenDoors is a readers’ advisory program aimed at middle- and high-school-aged readers. Our goal was to adapt librarian Nancy Pearl’s concept of the “four doorways” of adult readers’ advisory (plot, setting, character, and language) for use with YA works. Working with St. Thomas School, our team created an informational poster, bookmarks, and a Tumblr blog. Students are provided with a number of titles as a starting point and encouraged to explore further and to share their own discoveries via Tumblr. For some readers, these materials may get them thinking about why they enjoy the books they do and encourage them to seek out more diverse reading materials; others may use the categories simply as a field of suggested titles to draw from. In either case, they will be making new finds and actively considering what they liked about the books and why.