During World War I, a passionate romance blossoms between American ambulance driver Lt. Frederick Henry, serving with the Italian army, and British nurse Catherine Barkley. As they navigate the grim landscape of war, their love provides a temporary sanctuary from the surrounding chaos. The bond between Frederick and Catherine deepens as they share moments of tenderness amidst the oppressive realities of conflict, making plans for a future together away from the battlefield.

However, the relentless nature of war introduces significant challenges, both physical and emotional, to their relationship. Frederick's dedication to his military duties and Catherine's commitment to her nursing responsibilities create a constant tension. As the war's brutality and unpredictability continue to escalate, their love faces intense trials, pushing them to the edges of their endurance and hope.