When a devastating IRA bombing claims the life of his teenage daughter, quiet London businessman Quan is thrust into a relentless quest for justice. As his buried past resurfaces, he embarks on a one-man vendetta, determined to hunt down those responsible. His pursuit puts him at odds with a high-ranking British government official—one who may hold the key to uncovering the elusive terrorists. In a deadly game of cat and mouse, Quan proves that grief can be a powerful weapon.