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 Síochána, 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 suspension from the Special Detective Unit. While awaiting disciplinary proceedings, she’s pressed into service by the secret division to investigate the deaths and what might be the tip of a conspiracy and academic cover-up. Soon O’Donnell’s teamed with Geoffrey Bullfinch and Wendell "Mack" Macklemore of O.C.L.T. On a race through medieval ruins and holy sites, she must collect puzzle pieces, fragments from a forgotten pulp writer and bits of secret Druid history to stop the shadowy band of disciples before it awakens something long sleeping beneath one of Ireland’s most famous landmarks, something modern technology and firepower can’t defeat.

Cries in the night from her daughter Heaven are just the beginning for Gabrielle Harris. What seem to be nightmares about Heaven's favorite cartoon characters soon lead Gab to a stranger paranormal conspiracy focused on revenge. She's faced with a living nightmare in which friends die and dangeroussorcery is at work.With only the help of a strange holy man named Danube, Gabrielle battles supernatural forces for her daughter's life and soul and for her own sanity, especially when she learns she has to face not cartoon characters but demonic forces and hell itself. Nothing short of a trip into the depths of Hades will end the terror.