The Shepherd King Series 2 Books Collection Set includes two books titled "One Dark Window" and "Two Twisted Crowns" by author Rachel Gillig. The collection is aimed at young adults and features a captivating narrative in the non-fiction genre. With beautiful illustrations by Rachel Gillig, this paperback set is published by Little, Brown Book Group UK Ltd and is sure to provide an engaging and immersive reading experience for fans of the genre.