When Amos Decker and his FBI colleague Alex Jamison are called to London, North Dakota, they instantly sense that the thriving fracking town is ripe for trouble. They are ordered to investigate the death of a young woman named Irene Cramer, whose body was expertly autopsied and then dumped in the open --- which is only the beginning of the oddities surrounding the case. As Decker and Jamison dig into Irene's life, they are shocked to discover that the woman who walked the streets by night as a prostitute was a teacher for a local religious sect by day --- a sect operating on land once owned by a mysterious government facility that looms over the entire community.