To Catch an Urchin is where the twins meet Clara O'Dea and her network of child spies in Babylon Alley. Her price is a favour: free the children working in a Blighter-run factory warehouse.
Part 3 of 5 in Sequence 3: A Modern Babylon
Talk to Clara, who seals the deal by spitting in her palm and shaking Evie's hand. Go to the factory warehouse, kill the foreman and release the working children. Stay hidden to keep the alarm silent; once the children run, a group of Rooks arrives to fight the Blighter guards outside.
Clara's urchins trade intelligence for help like this throughout the game. Freeing children from factories is also one of the borough activities, and completing five Child Liberation memories earns the Children's Aid Society achievement.
The title nods to To Kill a Mockingbird. Historically, the factory conditions shown are closer to the 1840s or 1850s than to 1868, when Factory Acts already limited child labour.
Clara greets the twins in Babylon Alley as if she has been expecting them, which she has, since her children already know the streets and the people on them. She asks for help with factories that run almost entirely on child labour and offers intelligence in return, pointedly saying it is something Jacob clearly lacks.
Once the children are free, a group of Rooks turns up to fight the Blighter guards outside, so you only need to stay hidden until the release itself. Deal with the foreman quietly to keep the alarm silent.
Somewhere That's Green
Somewhere That's Green is the first London memory: as Jacob you step off the train in Whitechapel, chase a pickpocket, race Evie up a factory roof and meet Henry Green, the Assassin who has been watching over the city. It ends with a carriage chase to shake off Blighters.
Abberline, We Presume
Abberline, We Presume introduces Sergeant Frederick Abberline, who meets the twins in a Whitechapel alley wearing a dress and bonnet. To earn police cover you kidnap a criminal named Homer Dalton and deliver him alive to Abberline's carriage.
Gang War: Whitechapel
Gang War: Whitechapel is the showdown for the borough: with Henry's new kukris, you lead the Rooks against Rexford Kaylock's Blighters at the Whitechapel train station, then chase Kaylock along the roof of his moving train. Winning gives the twins their Train Hideout.
The Lady with the Lamp
The Lady with the Lamp brings Evie back to Lambeth after the asylum's closure. When Clara O'Dea collapses at the asylum doors, Florence Nightingale takes her in and gives Evie a list of medicines to fetch from a peddler and a besieged pharmacist.