A group of displaced European refugees and prisoners is being held under the supervision of British soldiers in an abandoned theater in Germany after World War II. Capt. Ridley (Dennis Price) and Sgt. Barnes (William Hartnell) struggle to control the squabbling among people of different backgrounds, and attempt to appeal to the group's humanity. The only things that unite the disparate group are the impending threat of plague and their collective hostility toward the British soldiers.