October 5, 1973. On the first day of Yom Kippur, the commanding officers at a top-secret Israeli military facility fail to heed the desperate warnings of Avinoam, a young intelligence analyst convinced that a war is about to break out. Meanwhile, Alush and Marco, two members of the nearby 87th tank crew, ask their commander to intervene on behalf of their friend and fellow soldier Melakhi, a social justice activist who’s been arrested in Jerusalem for political insurgency. As the Syrian army mounts its attack and air-raid sirens begin to blare, Meni, a journalist and television personality, realizes his estranged, newly-enlisted son is headed to the frontlines.

With reinforcements hours away, Yoav leads his small unit in an against-all-odds fight to protect the untrained and ill-equipped Hermon intelligence soldiers. Not far away, Yoav’s girlfriend Dafna, a female officer, resists orders for all women to evacuate the frontlines. Meanwhile, the 87th is thrust into battle and suffers a devastating loss. Hoping to get back to his friends in the tank crew, Melakhi hitches a ride with Meni, who’s heading out of the city in search of his son.

After Syrian forces infiltrate Hermon, Avinoam attempts to lead his fellow soldiers to safety through the facility’s secret tunnels. While Alush looks out for Yoni, a shell-shocked paratrooper, the 87th grows increasingly worried about the mental stability of their new commander, Caspi. Meni, Melakhi, and Dafna bond as they journey to the Golan Heights to find their loved ones.

Beyond hope of rescue and with no way of returning to safety, Marco leads the 87th in a rebellion to subdue Caspi. At the foot of the mountain, Yoav, Avinoam, and the Hermon soldiers find themselves in a brutal ambush and, later, Avinoam makes an unlikely connection with a Syrian soldier. As communications begin to collapse, Dafna tries to restore order back at her tumultuous command post.

With Syrian forces advancing on their location, Marco tries to use a stranded pilot as leverage for a rescue mission. Meanwhile, Melakhi remains determined to find his friends, despite revelations from Meni about a possible informant in their inner-circle. Alone in Syrian-controlled territory, Avinoam and Yoav find a common bond in the most dangerous of circumstances.