After a demonstration of new PT boats, navy brass are still unconvinced of their viability in combat, leaving Lt. "Rusty" Ryan frustrated. After the attack on Pearl Harbor, however, Ryan and his buddy Lt. Brickley are told they can finally take their squadron into battle. The PT boats quickly prove their worth, successfully shooting down Japanese planes, relaying messages between islands, and picking off a multitude of enemy ships.
Major Joppolo and his men are assigned to restore order to the war-torn Italian town of Adano. He has to manage getting supplies into town without interfering with troop movements, all the while dealing with colorful citizens of the town. One of his quests is to replace the bell which orders the town's life.
Spoiled playboy Henry van Cleve dies and arrives at the entrance to Hell, a final destination he is sure he deserves after living a life of profligacy. The devil, however, isn't so sure Henry meets Hell's standards. Convinced he is where he belongs, Henry recounts his life's deeds, both good and bad, including an act of indiscretion during his 25-year marriage to his wife, Martha, with the hope that "His Excellency" will arrive at the proper judgment.