Karl Marx gives the Karl Marx London Stories. He tells the twins they have helped the comfortable but not the workers who need it, and sets them five jobs: dodging police spies, exposing an abusive factory, stopping a bombing and protecting his rally.
The twins take out police spies so Marx can pass the time and place of a meeting to his allies. On the way he learns a comrade named Simon has betrayed him, and has the Assassin bring Simon to him for a telling-off before letting him go.
Marx suspects a factory of abusing its workers but has no proof, so he suggests setting a few cotton bales alight and taking the records in the confusion. Later his friend Frank Morris plans to blow up the Palace of Westminster with Templar explosives, and Marx asks the twins to stop him.
Marx fears saboteurs at his reform speech and asks for an Assassin in the crowd. Blighters try to kill him and are stopped. Afterwards he invites the twins to join his party and then offers honorary membership; both refuse, and he jokes that they share his persistence.
Despite the Assassin's efforts, Morris dies in an explosion caused by his own recklessness. Marx is saddened but thanks them for preventing something worse.
Agnes MacBean
Agnes MacBean is the Scottish engineer who owns the train the Frye twins use as their moving hideout. She comes with it after the Whitechapel gang war, keeps it running and improving, and sets up the Train Hideout side stories.
Alexander Graham Bell
Alexander Graham Bell is the twins' inventor in Syndicate. He turns a broken grappling pistol into the rope launcher, adds hallucinogenic darts to their gauntlets and builds voltaic bombs, all while fighting Starrick's grip on the telegraph.
Arthur Conan Doyle
Arthur Conan Doyle appears as Artie, a schoolboy and penny dreadful fan who teams up with Henry Raymond and the Frye twins to solve the murder cases of The Dreadful Crimes.
Arthur Weaversbrook
Arthur Weaversbrook is the Fleet Street newspaper owner whose papers made Jack the Ripper famous. In the 1888 expansion he becomes Evie's main contact for side work: the Ripper letters, the lieutenant hits and the Rooks' smuggling cargo.