1920s England. Sarah Piper’s lonely, threadbare existence changes when her temporary agency sends her to assist an obsessed ghost hunter. Alistair Gellis—rich, handsome, and scarred by World War I—has been summoned to investigate the spirit of the nineteen-year-old maid Maddy Clare, who is said to haunt the barn where she committed suicide.

London, 1925. Glamorous medium Gloria Sutter made her fortune helping the bereaved contact loved ones killed during the Great War. Now she's been murdered at one of her own séances, after leaving a message requesting the help of her former friend and sole rival, Ellie Winter. Ellie doesn't contact the dead—at least, not anymore. She specializes in miraculously finding lost items. Still, she can't refuse the final request of the only other true psychic she has known. Now Ellie must delve into Gloria's secrets and plunge back into the world of hucksters, lowlifes, and fakes.

In 1919, Kitty Weekes, pretty, resourceful, and on the run, falsifies her background to obtain a nursing position at Portis House, a remote hospital for soldiers left shell-shocked by the horrors of the Great War. Hiding the shame of their mental instability in what was once a magnificent private estate, the patients suffer from nervous attacks and tormenting dreams. But something more is going on at Portis House—its plaster is crumbling, its plumbing makes eerie noises, and strange breaths of cold waft through the empty rooms.

July 1995. April and Eddie have taken a wrong turn. They’re looking for the small resort town where they plan to spend their honeymoon. When they spot what appears to a lone hitchhiker along the deserted road, they stop to help. But not long after the hitchhiker gets into their car, they see the blood seeping from her jacket and a truck barreling down Atticus Line after them.

In 1977, Claire Lake, Oregon, was shaken by the Lady Killer Murders: Two men, seemingly randomly, were murdered with the same gun, with strange notes left behind. Beth Greer was the perfect suspect - a rich, eccentric 23-year-old woman, seen fleeing one of the crimes. But she was acquitted, and she retreated to the isolation of her mansion.