Annandale Military Academy's summer camp at Walsingham College, Oxford, is no place for the until a very persistent ghost shows otherwise. When two University of Chicago grad students and their uncle plan their honeymoon and his summer vacation in England, their family heritage draws them into a series of magical events beginning with visitations from a long-dead patron of the College and ending at the foot of Glastonbury Tor. In this sequel to Rough Magicke, Bishop Jonathan Mears and his family uncover not only the roots of their own craft but darker secrets as well.