The Dreadful Crimes is a DLC pack of ten detective cases for Syndicate. You examine crime scenes with Eagle Vision, question witnesses and then accuse one suspect; a correct answer earns gear and exclusive artwork, a wrong one can start a fight.
Each case gives you a set of locations to search. Clues are highlighted with Eagle Vision, and talking to a witness about a clue can unlock new lines of questioning or new places to visit. Once you have enough evidence, you pick the person you think is guilty. Raymond writes up every solved case as a penny dreadful for Purlock Publishing.
1. A Simple Matter of Murder! 2. The Case of the Conflicted Courtship. 3. Death Stalks the Colonel. 4. The Fiend of Fleet Street. 5. The Mystery of the Twice-Dead Professor! 6. Locked in... to Die! 7. The Most Hated Man in London. 8. Next Stop: Murder! 9. Conjuring up a Killing! 10. Murder at the Palace!
The final case reveals that Henry Raymond has been the hidden hand behind the series. He uses clues gathered across the earlier cases to stage a bomb scare at Buckingham Palace and steal the Sceptre with the Dove, then takes Artie hostage on the palace roof, where the twins kill him.
Charles Darwin's London Stories
Charles Darwin's London Stories are side memories in which the naturalist, a friend of the twins since the Starrick's Soothing Syrup affair, asks for help as his enemies turn from argument to threats. You protect a fossil, destroy toxic flowers, tear down smear posters and finally rescue Darwin himself.
Charles Dickens's London Stories
Charles Dickens's London Stories are a set of side memories in which the novelist recruits Jacob and Evie Frye into the Ghost Club and sends them after rumours of demons, hauntings and spectral thieves around London. Most cases end with a human culprit behind the supposed ghost.
Epilogue
The Epilogue in Assassin's Creed Syndicate's memory list holds one memory, Pressed Flowers, where Evie collects flowers around London for Henry Green's herbarium. Collecting every pressed flower is also tied to the Language of Flowers achievement.
Karl Marx's London Stories
Karl Marx's London Stories are five side memories in which the exiled philosopher asks the Frye twins to help London's working people rather than the comfortable citizens they have already helped. You shield his union meetings from police spies, expose a dangerous factory, stop a grieving worker's bomb plot and guard a rally.