A "mesmerizing" (Stephen King) supernatural novel about a sinister mindfulness app with fatal consequences from the New York Times bestselling author of The Chill. In this "taut, creepy techno-chiller" (Paul Tremblay, author of A Head Full of Ghosts), recently laid-off newspaper reporter Nick Bishop takes a humbling job: writing a profile of a new mindfulness app called Clarity. The app itself seems...