Use your map to find the Jacob Memory marker in Lambeth, to the south of where we left off last mission. It’s quite a distance away so grab a carriage if you can. When you arrive, speak to the NPC to kick things off.
When you have control back you need to chase a merchant, a task made more difficult by his magical ability to lock gates. Your best bet is to keep running in the general direction rather than trying to stick right behind him.
You’ll notice in the sewers that there’s only one path forward. You can’t catch your target until you exit the sewer tunnels and are in the open air; close the distance and tackle him.
Follow the waypoint and climb upwards. use Eagle Vision to find your next target near the carriage; unfortunately, he’s leaving the area. Follow the carriage at a short distance and wait for it to stop; your target should climb out, allowing you to steal the plans.
Optional challenge: grabbing the plans while the target is busy will allow you to do so undetected.
There’s a bug here, unfortunately, and he might not get out. If this happens to you, try ramming his carriage with one of your own until he moves on, and hope he gets out at the next stop.
Once you have the plans, head to the next waypoint and go inside, using your Rope Launcher to reach the beams above. Eagle Vision will allow you to spot your next target, but make sure you spy all his guards, too.
Optional challenge: if you want the optional objective you should clear out any who could spot you approaching the target, and make sure the target himself doesn’t see you, either.
Approach the target to complete the mission.
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