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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.
Her father Mungo worked the rail yards of the new Garnkirk and Glasgow line. When his health failed in 1834, Agnes took his place on the locomotive and his identity with it. Around 1836 her employers found out she was a woman and transferred her to Starrick Industries in London as punishment.
After the twins beat Kaylock in Gang War: Whitechapel, the train passes to them and Agnes with it. She urges them to spend their money on the city, and over time adds upgrades to the train that serves as their home and headquarters.
In Stalk the Stalker she asks Evie to help her catch the young man following her on her errands; he turns out to be Nigel Bumble, who wants to join the Rooks, and she takes him on as a cleaner. She also keeps the twins informed of Rook news, as when Nigel is arrested, and patches up the driver's apprentice Bob after Jacob brings him back injured.
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.
Benjamin Disraeli
Benjamin Disraeli is the Prime Minister the Templars want dead in Sequence 7. Jacob poses as his bodyguard to save him, and the Disraelis later help the twins steal the Gladstones' invitations to the Buckingham Palace ball.