London, 1884: A series of bomb blasts in public places is causing mayhem throughout the city. Even Scotland Yard's CID office becomes a target, throwing suspicion on Constable Thackeray. The primary suspects are Irish terrorists seeking independence, but could the villain be someone else? A beautiful Irish woman? An American athlete? Sergeant Cribb reluctantly enrolls in a bomb-making course and infiltrates the Dynamite Party. Based on the real events in London between 1884-1885, the story had its own resonance ninety years on.