Man in the Middle (1964)

Amid the chaos of World War II in a secluded jungle outpost, an impulsive American soldier commits a shocking murder, killing a British sergeant. Stalwart Lt. Colonel Barney Adams, portrayed by Mitchum, is sent to represent him during the court martial. As Adams investigates, he faces numerous obstacles, with crucial witnesses vanishing mysteriously. It becomes clear that he is entangled in a larger conspiracy, potentially reaching the upper echelons of military authority, challenging his quest for justice and integrity in a war-torn world.