Hired to draw a map of tourist sites in a small Northern Ireland town, cartographer Richie Markey (Brian F. O'Byrne) uncovers a dark secret and realizes that his map may hold the key to the mysterious disappearance of another surveyor. The missing man had been accused of informing on two IRA soldiers, and when Markey discovers his body, it doesn't take long for him to draw the conclusion that he may be next on the group's list.