When we swung around a jungle bend on our patrol boat, we discovered the river had already swallowed its dead: a half‑sunken recon launch, blood‑slashed planks, and no survivors.

In 2009 Afghanistan, Sergeant Eli Kane leads a small U.S. squad to investigate a mysterious distress signal coming from a long-abandoned Soviet outpost. The signal is using a U.S. military ID code belonging to Captain Nathan Harrow—a soldier who went missing in 1987