In London's East End, a corpse tumbles from a ship. Tangled in a tarpaulin, it has lain forgotten for years. A scrap of paper in its pocket reads 'Roxbury'.  The shadows of European machinations loom over the capital. For Sergeant Campbell Lawless, fears become reality as a series of explosions tear across the country. Home Office anxieties lead Lawless to Roxbury House, where the Earl of Roxbury, the country's foremost weapons manufacturer, resides with a cavalcade of innovative scientists and researchers. Lawless places his best agent, ex-street urchin Molly, in the Earl's home as he races to find those behind the attacks before the tinderbox of Europe is ignited.