This Week at Book Riot October 6, 2017 | Written by: Kelly on October 6, 2017. Over on Book Riot this week… Bookish costumes for your pet. If you aren’t already, you should hop in and have fun with the Instagram #RiotGrams challenge this month. Over 140 YA books hitting shelves through the end of the year. A round-up of YA books set in Puerto Rico.