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.

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.

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.

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.

Staring down hundreds of enemy tanks in a seemingly hopeless battle, Melakhi steps up to lead the 87th, forcing his crew to rethink their entire training in order to make it out alive. Meanwhile, when Avinoam surrenders himself to protect Dafna, his fears of captivity come to fruition. With their very survival in question, Meni and Yoni finally reconcile, and Marco looks to make amends with Melakhi.

At base, Avinoam faces questions from military police, who seem more concerned about the abandoned Hermon facility than rescuing Yoay. Trapped in a hilltop bunker as the Syrian army closes in, the 87th must decide who will make a crucial sacrifice. Nearby, Meni attempts to convince a tank crew to help him reach his son.

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.

Despite their mental and physical wounds, Melakhi, Marco, and Yoni volunteer to head back into the inferno. As the hours tick down toward a massive armored battle, Melakhi turns his suspicions on Marco, while Dafna and Avinoam realize they have a shared connection.

At command, Meni challenges the army's seeming indifference to his son's fate, while Dafna takes on a mission no one else is willing to handle. Meanwhile, Avinoam does his best to bring a wounded and desperate Yoav to safety, and as the 87th tries to hold back the Syrian army, Melakhi confronts Alush for ratting him out to the police —but learns of an entirely different deception instead.

In the brutal Valley of Tears battle, the tank crew faces impossible challenges and suffers heavy casualties at point-blank range. Meanwhile, a Syrian interrogator tests Avinoam's determination to guard intelligence secrets.