Nathaniel Wakeman is the only child and son of a modest vicar, who lives in the quiet and idyllic confines of the Isle of Wight. When his maternal grandfather dies, Natty's mother reconnects with her estranged and wealthy brother and his family in hopes of raising Natty up in the world, to urge him to go beyond the humble life he's always known.
Though his cousins show no particular regard for him, one of them, at least, lures him away from his retired life and introduces him to the world—and to the son of a baron from Somerset, Miles Lovell. Natty gradually finds himself drawn toward the older and worldlier gentleman and returns to his father's vicarage a changed young man. He also seems to have attracted the attention of a ghost, one that has followed him back to the island.
Haunted by a woman in white, who seems to appear when he's at his weakest, Natty struggles with his own nature and with his family's increasing difficulties. His mother is distant, hiding things from him as she never has, and his father is aging before his eyes. Quarrels between his parents grow more and more frequent, and Natty's increasing terror of familiar and beloved footpaths add to the spiraling tension at home.
While Natty tries to find his place in the world, his childhood is crumbling around him, and he becomes more and more convinced that his persistent ghost is a harbinger of doom.