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. The promise of a second gold rush has attracted an onslaught of newcomers all hoping for a windfall, and the community is growing faster than houses can be built. The sudden boom has also brought a slew of problems with it, including drugs, property crimes, prostitution - and now murder.