Adult SFF Backlist Books is a year-long challenge hosted by Bookish Valhalla, where readers are encouraged to prioritize back-listed adult science fiction and fantasy stories inspired by monthly themes. Participants will earn a badge if they complete at least 80% of their goals (OR 10/12 themes). If participating, please be sure to add your book(s) for each theme to this challenge. That way, other readers can check them out, too :) Also, please sign up on our roster form so we can track each other's progress.