Speak to Samuel and board the boat, to Kaldwin's bridge.
The major problem here is going to be the Archon light stations. They shoot nasty lightning at you for tons of damage, even on lower difficulties.
There will be 3 areas total in this mission. 5/5 bone charms and 5/5 runes + 1 safe, as well as 1 Solokov painting. Also note an outsider shrine for 100% completion see the appropriate sections.
Taking down the Light stations can be hard, but to make things much easier. I suggest having at least a level 1 BLINK power. If you don't your going to have to look around everywhere and climb a ton. Where there is a will there is a way though.
Usually to stop the 2 archons, and one more towards the end, is the switches and fuel stations. The first two can be accessed by simply sneaking or blinking to the correct fuel stations, and either rewiring or taking out the fuel.
Don't hit the bridge switch up top, it will only raise the bridge and we do NOT need to raise it.
There will be an optional side quest here as well. The problem is it is useless and you will only lose HP and solokov potions.
The Final archon light, will require you to climb or blink to a switch, pull it to stop the rotating wheel.
After stopping the wheel you can climb or blink through it, and defuel the last archon light, then head to solokovs house.
From here it is simple, follow marker to solokov. Talk to him then choke him unconscious. Carry him after and use blink to speed things up to samuel who will bring him back to the pub for interrogation. This will start mission 5.