A tragic disappearance... After a harrowing supernatural confrontation on the shores of Exmouth, Massachusetts, Special Agent A.C.L. Pendergast has gone missing and is presumed dead. A shocking return... Consumed by grief, Pendergast's ward, Constance, takes refuge in her chambers in the basement of the mansion at 891 Riverside Drive, where she soon becomes the captive of a shadowy figure from the past. An international pursuit... Proctor - Pendergast's devoted bodyguard - goes on the hunt, pursuing Constance's kidnapper: crossing cities, overcoming oceans and dead lands. But in the world of black and white, nothing is what it seems at first glance. And by the time Proctor recognizes the truth, the terrifying mechanism will be set in motion - but perhaps for some it will be too late...