Belfast, Northern Ireland, 2004. Shannon Dillon discovers a document in her grandfather’s attic that appears to be written by beloved author C. S. Lewis. Oddly, the binder is covered with Occult symbols. Word leaks out, and within hours, three armed bandits burst into the house to steal the documents. Things turn sour when the American intruder shoots and kills Shannon's grandfather and brother. Shannon escapes out a window as the gooms take off with the manuscript. Traumatized, she vows blood revenge. Shannon travels to Milwaukee, Wisconsin, and recruits a reluctant evangelical college professor of literature to help her bring the American killer to justice. Once trained as an IRA sniper, Shannon is driven by revenge while Simon Magister drags his feet. Still, against his Christian values, Simon is drawn by scholarly curiosity and a repressed attraction to Shannon. The couple enters a dark world where two factions are willing to kill for the ‘Belfast Document.' Simon and Shannon narrowly escape death several times while others die along the way. Meanwhile, a slow-burn romance emerges between the two. The conflict involves right-wing fundamentalists who believe that Lewis's fantasy stories are occult inspired. Conversely, some big evangelical publishers want to obtain and destroy the document for financial reasons.