A fourth book in the Mercedes series

BevVincent

During the Q&A before the Library of Congress event on Saturday, King said that he has a book in progress that deals with one of the characters from the Mercedes series that's "an outright scary novel."

BevVincent

In this interview, King confirms that the fourth book will feature Holly Gibney.

Lou_Sytsma

Great news! She was left in a fragile state at the end of the third book. I can see her involved in a struggle for her life, her mind, and possibly her soul.