1786, Jerusalem College, Cambridge: they say Jerusalem is haunted by Mrs. Whichcote's ghost. Frank Oldershaw claims he saw her in the garden, where she drowned. Now he's under the care of a physician. Desperate to salvage her son's reputation and restore him to health, Lady Anne Oldershaw employs John Holdsworth, author of The Anatomy of Ghosts, an attack on the existence of ghostly phenomena. But his powers of reason have other challenges. Dreams of his dead wife and Elinor, the Master's wife, haunt him. At the heart of it all is the mystery of what happened to Sylvia Whichcote in the claustrophobic confines of Jerusalem.