If you are looking to back up or transfer your progress, save files are found in these directories depending on your platform:
In Assassin’s Creed Syndicate , Sequence 4, titled focuses on Jacob’s investigation into Starrick's Soothing Syrup and Evie’s search for a Piece of Eden. Sequence 4 Mission List & 100% Sync Objectives
Overview
We’ve all been there. You’re deep into the gritty, industrial streets of London, you’ve just recruited your first Rooks, and you’re tearing down a Templar stronghold... then your power flickers, your save corrupts, or you realize you missed that "Without a Grudge" achievement.
"Overdose" is the sequence’s highlight, reintroducing the "Unique Kill" mechanic. You can sneak in as a "cadaver" on a gurney to get a scripted, cinematic kill on Dr. Elliotson—a much more satisfying approach than a standard combat encounter.