Tensions are mounting between the United States and Spain. The president asks Lt. Andrew Rowan (John Boles) to travel to Cuba and deliver a message to rebel leader Gen. Garcia: The United States will need his help if war does break out. Rowan sails to Cuba and meets Raphaelita Maderos (Barbara Stanwyck), his guide through the dangerous jungle. On their way to the rebel headquarters they also meet Sgt. Dory (Wallace Beery), a deserter who may have a plan of his own.