Reaching Holger Square | Mission 2 - High Overseer Campbell Dishonored Guide
Last update: 11 May 2016
New Main Quest: Travel through the gate to Holger Square
The passage to the Holger Square is guarded by four guards. Especially in this situation, I would recommend dealing with them, or at least with the one occupying the guard booth, since there is a rune hidden there (the above screenshot). You can also find food and a note (confiscated rune) inside. There's also a rewire tool on one of the crates outside.
Still, if you don't want to be noticed by the guards and have to fight them, start climbing onto the roofs using Blink (teleport), in order to get safely to near the gate. Interact with the gate and confirm that you want to leave for the [Holger Square].
New Main Quest: Speak with Overseer Martin in Holger Square
New Main Quest: Use the release lever to unlock Overseer Martin
After you get to the new location, go straight ahead. Carefully, approach the restrained Overseer Martin and overpower or kill the guard standing in front of him. Afterwards, approach Martin and use the lever on the left to liberate him. Then, listen to the conversation.