NATIONAL BESTSELLER!BEST BOOK OF 2018 (Library Journal, NPR, Buzzfeed)JULY 2018 INDIE NEXT PICK!SUMMER 2018 PUBLISHERS WEEKLY PICK!"A tremendous book―thought-provoking and terrifying, with tension that winds up like a chain.�...

A history teacher begins his unorthodox senior course with clips from an ominous surveillance video, causing a student's home life to deteriorate along with the lessons. A girl with a second head that changes into different historical...