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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.
Artie loves detective stories and follows Raymond to crime scenes. Together with the twins they work through a string of murders across London, and Artie starts to suspect the cases are connected.
Artie gets close to the truth and is abducted. On the palace roof, Raymond holds him as a shield; one twin distracts Raymond while the other comes up behind and kills him. Artie says he will still miss the penny dreadfuls, Jacob suggests he write crime stories himself, and Evie tells him to use his full name.
In the first case, at a Whitechapel warehouse, accusing the obvious suspect prompts Artie to tell you to look past surface appearances and keep digging. The same advice returns as a clue in the final case.
When Artie disappears during Murder at the Palace, his yard holds an evidence wall tying the earlier cases together, ending in an unfinished line that points at Raymond. Dooley, from the first case, explains that Artie wrote important notes in lemon-juice ink that shows up over smoke, and a blank sheet leads on to Purlock Publishing.
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 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.