John Addison

"World-famous scientist Michael Armstrong .. and his fiancée/assistant, Sarah Sherman .. travel to Copenhagen for a physics conference. When Sarah mistakenly intercepts a message meant for Armstrong, she believes that he is secretly defecting to East Germany. As Armstrong goes undercover to learn top-secret information, the couple find themselves running for their lives from enemy agents"--Container.

A disfigured musician living at the Paris Opera falls in love with and tries to further the career of a beautiful young singer who is being wooed by another man.