Lakota FBI Agent Manny Tanno is back in action with his faithful tribal officer sidekick Willie when a man is found drowned in a Pine Ridge Reservation Lake. The apparently accidental drowning turns out to be murder, and the investigation takes them on the road to the man's home reservation in Wyoming.

Out of their element and unwelcome, no one on the Wind River Reservation is going out of their way to help Manny and Willie. In fact, some are purposely getting in the way. It gets even worse when they discover a decades-old unsolved murder with a connection to the man found murdered on Pine Ridge. Meanwhile, back at Pine Ridge, a Rapid City criminal's car keeps showing up at murder scenes.

Dark forces afoot on both reservations thwart the investigation at every turn. Not to mention the darker visions assaulting Manny at the worst possible times. And it's not just the spirit world that's out to get him. The case of the Pine Ridge murder balloons into a rush to catch the Wind River murderer before he racks up more victims-and before Manny himself is next.