In Dublin, Ireland, academics and historians are dying. An unidentified venom is to blame. Strange markings from deep in the Emerald Isle's past suggest adherents to lost and forbidden knowledge may have reorganized. Detective Aileen O'Donnell of Ireland's National Police Service, An Garda S och na, has never heard of the agency's sub rosa unit devoted to investigation of the strange and paranormal. That is, until a shooting incident leads to her...