Hysteria is the fourth tie-in story, and the second novel, for Reign written by Lily Blake, after The Haunting. It is set to be published on May 12, 2015 by the publisher Little, Brown Books for Young Readers. It is set to be followed by a third Reign YA novel.
Something sinister has been sweeping the villages surrounding the French court. Rumors of Satan's horsemen traveling the countryside and claiming the souls of villagers have sent the people reeling into a religious frenzy and soon fear and suspicion lead them to accuse a young girl of witchcraft. After the prisoner is brought to the palace for questioning, Mary, Greer, Kenna, and Lola work to prove her innocence. But there are others who will stop at nothing to see the girl and her secrets silenced forever...