Chapter 11 called "Darkwater police station". You return here after the events shown in chapter 10 when Sarah Hawkins and Drake Algernon cast Shambler out for good.
Chapter 12 - another one titled Darkwater Port. The main protagonist gets out of prison, however, the town is overrun by frantic citizens forcing Edward Pierce to use firearms to defend himself.
Chapter 13 is called Abandoned whaling station. The main protagonist gets here while searching for Sarah Hawkins and after getting through the town overrun by mad townspeople.
The last, and the fourteenth chapter titled "Coastal Cave" and then "Alabaster Point". The main protagonist catches up with Sarah Hawking and has to make a decision that will affect the fate of the world.