《骇人命案事件簿第二十季》的凶手是谁？

简介：Causton, a city on the outskirts of London, is buzzing with excitement as a new brewery opens at the site of a famously cursed Abbey. The brewery is expected to bring in millions of pounds of tourism and jobs, but the locals are skeptical that the brewery will be profitable. As the opening ceremony approaches, there are murmurs of concern among the crowd. It's said that the previous owner of the Abbey had been killed by a mysterious force after opening the brewery. Some people believe that the brewery is cursed, and they're afraid that it could be the same thing happening again. One evening, DCI Barnaby and DS Winter are called to investigate a gruesome discovery. A man has been found boiled to death in one of the vats. The police are puzzled; could …