This Child Liberation factory can be found in the western side of the Southwark borough, just west of the Waterloo Station building. It has four groups of children to liberate, a foreman to kill and a single alarm bell which we’ll need to avoid activating to complete the optional objective.

If you approach at ground level from the southern side of the factory building you should be able to make out the alarm bell just inside the door. Assassinate or use a throwing knife on the Blighter in the doorway before quickly running inside and sabotaging the bell so that it can no longer ring.

Once sabotaged we can cause as much or as little chaos as we want and still earn 100% synchronization. We’ll need to kill the foreman. An easy way to do this is to climb to the rooftop and find the open skylight on the western side of the building. From here we can perform an air assassination on him (or a double air assassination on him and another Blighter if you are patient).

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Disabling the alarm bell will make things easier (left). Afterwards climb to the rooftop and kill the foreman (right).

Once he is out of the way, there are also four groups of children to liberate who can be found in the following locations:

• In the southeast corner of the ground floor.
• In the southwest corner of the ground floor.
• In the northeast corner of the ground floor.
• In the northwest corner of the ground floor.
  Once you have killed the foreman and freed all of the children, the memory will be complete.