Jack's Lieutenants: City of London is an assassination activity in the Jack the Ripper DLC: four of Jack's gang bosses meet at Cannon Street station, and Evie infiltrates the station to kill them all for Arthur Weaversbrook.
Get into Cannon Street station, find each lieutenant and kill them. Simon Swins has three bodyguards; frighten all of them before you take him out to earn full sync.
Cannon Street is a City of London terminus opened in 1866 on the north bank of the Thames, reached by a railway bridge from Southwark. The game places it further upriver, roughly where Blackfriars station stands, and treats it as a stop rather than a terminus.
Jack's lieutenants are the gang bosses who run his criminal network, many drawn from Rooks who work willingly for their 'Mr. Jack'. These four have come from across London to talk about the future of their business.
A fear bomb thrown among Simon Swins' three bodyguards is the direct way to meet the full sync, leaving Swins exposed for the kill.
Dear Boss
Dear Boss is the last Ripper Letters activity in the Jack the Ripper DLC: Weaversbrook needs to know whether the 'Dear Boss' letter came from a madman or a newspaperman, so Evie follows its suspected author to a dockyard and makes him talk.
From Hell
From Hell is the first Ripper Letters activity in the Jack the Ripper DLC: handwriting experts have named a suspect for a new letter, and Arthur Weaversbrook asks Evie to make sure he is not the real killer.
Saucy Jack
Saucy Jack is the second Ripper Letters activity in the Jack the Ripper DLC, named after the real 'Saucy Jacky' postcard. Evie runs down its supposed author for Arthur Weaversbrook and finds a man with a political motive.
Anarchist Intervention
Anarchist Intervention is the third Karl Marx memory: Marx's friend Frank Morris, whose son died of exhaustion after an 18-hour shift, plans to steal Templar nitroglycerin and attack Parliament. You chase Morris down, take over the explosives cart and protect him from the people who want it back.