After many nights of flipping through countless books in the Keepers' vast library, I came across something rather interesting. It would seem the Hammers had a few problems with loyalty in the past and some members had broken with the order and formed new factions long before the whole incident with Karras and the Mechanists.
In an old ledger, with pages so brittle I had to be careful not to turn them into dust in my hands, I found a few vague references to a Hammerite church far to the west, in the town of Whitewater. It would seem that they had turned against the order and sealed the town of Whitewater letting no-one leave or enter.
After a few pages with very little information on why they would do this or how they were dealt with, I realized that the Keepers probably didn’t know what had happened to them. However, there was also a letter nicely folded between the pages, no doubt something some Keeper operative had ’recovered’ from the Hammers.
The letter was signed by a certain ”Brother Marcus of the Order” (More...)
Additional Comments:
Make sure you have at least 1 rope arrow at all times since it's the only way to get to the other part of town.