The Celtic Double-Cross is a role-playing game supplement created by Carl Sargent for the Shadowrun Second Edition RPG. Published in 1993 by FASA, it adds a new twist to the game with a focus on Celtic mythology and culture. The book provides players with new rules, character options, and a unique setting to enhance their gaming experience. With its English language publication, the Celtic Double-Cross supplement is a valuable addition to any Shadowrun player's collection.