Christian tradition holds that the wood of the cross used to crucify Jesus survived him, becoming the most venerated relic in the medieval world, claimed and fought over by emperors, crusaders, and popes. This film traces that story from its supposed discovery by Helena, mother of Constantine, through centuries in which fragments of the cross traveled Europe as diplomatic gifts, war trophies, and objects of pilgrimage. The relic's trail runs cold after the 12th century, when it disappears from the historical record following the Crusader defeat at the Battle of Hattin, and the film treats that vanishing as the open question at its center. Along the way it tracks how an instrument built for torture and execution became a symbol worth killing for, carried into battle and locked in cathedral treasuries. The sourcing here is thin and the account leans heavily on tradition rather than documented evidence.