When a bomb destroys the recently formed Special Irish Branch of Scotland Yard, all fingers point to the increasingly brazen factions of Irish dissidents seeking liberation from English rule. Volunteering their services to the British government, Barker and Llewelyn set out to infiltrate a secret cell of the Irish Republican Brotherhood known as the Invisibles. Posing as a reclusive German bomb maker and his anarchist apprentice, they are recruited for the group's ultimate plan: to bring London to its knees and end the monarchy forever.
Their adventures take them from a lighthouse on the craggy coast of Wales to a Liverpool infested with radicals, and even to the City of Light, where Llewelyn goes undercover with Maire O'Casey, the alluring sister of an Irish radical. Llewelyn again finds himself put to the test by his enigmatic employer, studying the art of self-defense and the brutal sport of hurling -- and, most dangerous of all, being schooled in the deadly science of bomb making.
It's May of 1884, and Scotland Yard has just been blown up, the latest attack in the Irish Republican Brotherhood's dynamiting campaign to force Home Rule. Young Welshman Thomas Llewelyn, apprentice to Scottish master detective Cyrus Barker, rushes to the scene of the crime with his mentor in this fast-paced, cleanly written follow-up to Some Danger Involved, Thomas's first historical crime novel featuring the intrepid duo. Despite the resistance of Scotland Yard's ineffective Special Irish Branch, Barker resolves to find and stop the radicals himself. His method: disguise and infiltration of the Fenian faction. Told from Llewelyn's keen and worshipful perspective, the tale traverses London and Europe and chronicles Barker and Llewelyn's undercover adventures and Barker's submersion in the character of German explosives expert Johannes van Rhyn. Llewelyn is brought into the thick of the action as van Rhyn's assistant, Thomas Penrith, an anarchist similarly skilled in bomb making. Together, they're initiated into the violent faction, called the Invincibles, while the younger double agent is enticed by the gorgeous redhead Maire O'Casey, sister of one of the terrorists. Can Llewelyn and Barker play along yet stop the Invincibles before they cripple the English government and bring down London's infrastructure? The action unfolds briskly, and Llewelyn's voice should appeal to boys of all ages.