During the autumn of 1886 London is plagued by both half-breed attacks and an anti-government insurgency. After fighting off rebels in Mayfair, Sir Galahad pursues the survivors into the Underground where he encounters a number of werewolf-like half-breeds known as Lycans. Galahad’s mentor, Sir Percival, one of the Order’s most veteran knights, suspects that there is a correlation between the two and requests permission to investigate the rebel stronghold of Whitechapel. His concerns are dismissed by the Lord Chancellor, who believes that the Order should remain dedicated to fighting half-breeds.
With tacit approval from Sir Lucan, the Order’s Knight Commander and adopted son of the Lord Chancellor, Percival and Galahad undertake a mission into Whitechapel accompanied by the other two members of their team, Lady Igraine and the Marquis de Lafayette. After encountering fierce resistance they reach the rebel headquarters in the abandoned Royal London Hospital, only to find it occupied by Lycans. Galahad and Igrane discover evidence of a rebel plot to infiltrate the Agamemnon, flagship of the United India Company’s airship fleet, and assassinate the company chairman Lord Hastings, a frequent guest to the Round Table. The team boards the airship and foils the assassination attempt before a bomb detonates on board. Hastings and most of the passengers are evacuated, but Galahad and Percival remain on board to search for the rebel leader. A second explosion sends the Agamemnon crashing into Hyde Park, destroying the Crystal Palace in the process. Galahad survives but discovers that Percival has been killed.