John and Wilhelmina Constable uproot their lives in Boston so John can pursue his lifelong dream of becoming an artist. After settling into a beautiful Victorian home on Nantucket, John finds inspiration in the island light that illuminates his attic studio and Willy relaxes happily into the slower pace of seaside life. Painting alone one stormy night, John is startled by the sight of a beautiful ghost. When he admits to his wife what he thinks he’s seen, Willy tries to remain rational and understanding. But all reason disappears as her husband grows steadily more obsessed with the striking, troubled specter who reveals herself only to John—and who seems determined to claim him as her own. Now Willy must draw on the strength of her love to save their marriage . . . and perhaps their lives.