’As a series of rolling blackouts plunge the city into darkness, Detective Aidan Waits sits on an abandoned hospital ward, watching a mass murderer slowly die. Transferred from his usual night shift duties and onto protective custody, he has just one job…To extract the location of Martin Wick’s final victim before the notorious mass murderer passes away. Wick has spent over a decade in prison, in near-total silence, having confessed to an unspeakable crime that shocked the nation and earned him the nickname of The Sleepwalker.