Special Agent A.X.L. Pendergast, together with his ward Constance Greene, travels to the quaint seaside village of Exmouth, Massachusetts, to investigate the theft of a priceless wine collection. But inside the wine cellar, they find something considerably more disturbing: a bricked-up niche that once held a crumbling skeleton. Pendergast and Constance soon learn that Exmouth is a town with a very dark and troubled history, and this skeleton may be only the first hint of an ancient transgression, kept secret all these years. But they will discover that the sins of the past are still very much alive.