“Atonement,” the feature debut of writer-director Reed Van Dyk, explores the complex emotional aftermath of a tragic incident during the 2003 Iraq War that left innocent civilians dead. Inspired by a 2012 New Yorker article by Dexter Filkins, the film centers on the intertwined lives of three individuals affected by a deadly firefight: Mariam, an Iraqi mother; Lou, an American soldier involved in the shooting; and Michael, a journalist covering the war.

Set primarily in Baghdad during the initial U.S. invasion, the story follows Mariam (Hiam Abbass), who is with her extended family when their home is bombed. Forced to flee, they encounter intense fighting as Lou (Boyd Holbrook) and his military unit exchange gunfire with insurgents. Amid the chaos, Lou mistakenly fires on Mariam’s family vehicle, killing her husband and two sons.

New York Times reporter Michael (Kenneth Branagh) investigates the incident by interviewing both Mariam and Lou separately. Mariam, grieving and hardened by loss, offers a poignant perspective on the devastation she has endured, while Lou expresses confusion and remorse, questioning why the family drove into an active firefight.

The narrative then fast-forwards more than a decade. Michael, now a New Yorker magazine writer promoting a book on America’s wars in Iraq and Afghanistan, is contacted by Lou, who has been struggling with guilt and psychological distress since returning to the United States. Lou seeks to reach out to Mariam, hoping that an apology may help assuage his torment and facilitate healing. Michael remains in contact with Mariam, who has since relocated to Glendale, California, but is uncertain if she will be willing to engage with Lou.

Van Dyk, who earned an Academy Award nomination for his 2017 short film “DeKalb Elementary,” known for its examination of gun violence, approaches “Atonement” with careful balance. The film delves into the complexities of forgiveness, grief, and responsibility without offering simplistic resolutions.

The performances anchor the film’s delicate emotional terrain. Abbass portrays Mariam as a multifaceted figure shaped by profound loss, embodying both strength and a lingering numbness. Holbrook’s depiction of Lou avoids stereotypical portrayals of soldiers, presenting him as an average man deeply affected yet struggling to articulate his remorse. Branagh’s Michael carries the weight of his journalistic role, revealing vulnerability beneath a professional exterior and hinting at his motivations for facilitating the reunion.

Rather than providing convenient closure, “Atonement” confronts the ongoing nature of trauma years after violence has occurred. The film underscores the different ways guilt, sorrow, and anger manifest and challenges viewers to grapple with the moral ambiguities of war and its lasting consequences. Through a restrained yet powerful narrative, Van Dyk presents a nuanced portrait of individuals bound together by tragedy, highlighting the enduring struggle toward understanding and reconciliation.