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is marketed as a police procedural set in a remote American military outpost in Afghanistan, and it is a page-turner, all 448 of them. It’s also so cunningly constructed that I had to read it twice to be sure I understood everything that was going on—and there are still a few loose ends. But it’s also an ambitious, if reticent, novel about good and evil, friendship and leadership, courage and shame that mainly succeeds.

Like a classic Agatha Christie country-house murder mystery, The Valley has a very limited geographic area and cast of characters. We follow Lieutenant Black—no first name—who’s been sent to a small American combat outpost to conduct a routine investigation: A villager’s house was damaged when an American soldier fired a warning shot in an unruly Afghan crowd, and the village chief complained to a passing civil affairs captain. Lieutenant Black is due to spend a week filling out the paperwork. Meanwhile, he has his own demons: Something has gone very wrong in what should have been a promising Army career, and this is a chance for him to prove himself.

The ramshackle Combat Outpost (COP) Vega—supposed to be the furthest-east, most isolated, and most dangerous American outpost in a Nuristan valley that ends at the Pakistan border—is home to 47 soldiers and one translator, or “terp,�� named Danny, the major Afghan character. The men are fighting with not only the Taliban but the villagers, who are also fighting the Taliban. Five days before Black’s arrival, a soldier from Vega fell behind 10 meters on a nighttime patrol and got snatched by locals. His end was gruesome.

In Army-speak, COP Vega is a “self-licking ice cream cone��: an isolated fort so poorly situated that it mainly exists to defend itself rather than to extend American control over terrain or people. Small wonder that the men are half-crazy with stress and treat Black as an enemy. It’s not even so odd that one soldier may be a killer. It is odd, though, that a soldier no one has heard of is listed on the personnel roster, and that another soldier Black meets in the flesh ������’t on the roster.

The U.S. Army doesn’t lose track of soldiers. Or does it?

The Valley draws as much on the conventions of gothic fiction as crime fiction: COP Vega is a castle clinging to a fog-wrapped mountain, surrounded by hostile, poorly understood forces. Black’s trip to COP Vega on a classically pitch-black, rainy night is full of ominous foreshadowing. There’s a joking road sign pointing to “Xanadu,�� a cryptic warning to “beware he who would be king.��

The Valley gives the best description of the American military base environment (and the post-9/11 Army) that I’ve ever read, both accurate in the details and evocative in atmosphere. John Renehan nails the big Forward Operating Bases (which are anything but forward) and the tiny, patched-together COPs up in the hills or on dusty plains where the rubber meets the road. He also captures the tensions between noncommissioned officers and junior lieutenants, and between junior enlisted and NCOs. This is all, by extension, a portrait of America today. Consider this:

The room was standard-issue meathead. Heavy-metal posters and jugs of workout powder. An Xbox video game system sat on a shelf beneath a small and beat-up monitor.

Or this description of Lieutenant Pistone, the commander of COP Vega:

He became your squared-away super-soldier, in his own way. Fastidiously organized, diligent about physical training. Not necessarily a good leader. He walked around with the sound track of his freshly awesome life playing in his head. He tended to forget that succeeding in the military was not so much about his own cosmic journey to heroism as it was about how good he was at dealing with people, handling people, taking care of people.

It comes as a shock to read in Renehan’s acknowledgments that the pain-stakingly observed Afghan setting is a work of imagination. Renehan served as an artillery officer in Iraq and has never been to Afghanistan. As this suggests, Renehan is not only a brilliant writer, but a very clever one. Still, there are some first-novel fault lines here: The Valley is written in a close third-person, almost entirely from the point of view of Lieutenant Black. (The couple-dozen pages that take the points of view of other characters are far less successful.) But there’s a major surprise at the end, and the closeness of the narration makes it seem as though the author is pulling a fast one on us.

More seriously, I wish the novelist had opened up his main character more toward the end. He has elegantly avoided all the redemption clichés we might have expected, but the ending feels a bit choked, and The Valley ends on an uncertain note.

Renehan has spoken in an interview of writing a sequel, and I can’t wait; I hope there’s a movie, too. “You are [a] man who needs the truth,�� the Afghan terp Danny says to Lieutenant Black. And we need these truths about our wars and our soldiers, too.

__This article originally appeared in the July 6 - July 13, 2015, Vol. 20, No. 41 issue of the Weekly Standard.__