Grace McGuiver, a budding anthropologist, arrives in the Azores Islands of Portugal. To get there, she travels on an ancient cargo boat auspiciously named the Holy Ghost. Little does she know her arrival will set into motion a series of deadly events that will threaten her ability to do what she came to do. She becomes embroiled in island superstitions and intrigue, and faces unknown foes and accusers. Hers is a story of romance, mystery, and magic.