汤姆·哈迪,李梅,杨雁雁,蒂莫西·奥利芬特,福里斯特·惠特克,贾斯汀·康维尔,奎琳·塞普尔维达,路易斯·古兹曼,米歇尔·沃特森,冯推守,吉姆·凯萨,克塞利亚·门德斯-琼斯,理查德·哈林顿,娜格斯·拉什迪,詹妮弗·阿尔莫,汤姆·吴,杰瑞米·安·琼斯,吉尔·温特尼茨,戈登·亚历山大,戴维·张振熙,杰克·莫里斯,Jon-Scott Clark
Haunted by the memory of Walter Holderlin, a soldier he killed during World War I, French musician Paul Renard (Phillips Holmes) confesses to a priest (Frank Sheridan), who grants him absolution. Using the address on a letter he found on the dead man's body, Paul then travels to Germany to find his family. As anti-French sentiment continues to permeate Germany, Dr. Holderlin (Lionel Barrymore) initially refuses to welcome Paul into his home, but changes his mind when his son's fiancée Elsa identifies him as the man who has been leaving flowers on Walter's grave. Rather than reveal the real connection between them, Paul tells the Holderlin family he was a friend of their son, who attended the same musical conservatory he did. Although the hostile townspeople and local gossips disapprove, the Holderlins befriend Paul, who finds himself falling in love with Elsa (Nancy Carroll). When she shows Paul her former fiancé's bedroom, he becomes distraught and tells her the truth. She convinces him not to confess to Walter's parents, who have embraced him as their second son, and Paul agrees to forego easing his conscience and stays with his adopted family. Dr. Holderlin presents Walter's violin to Paul, who plays it while Elsa accompanies him on the piano. The film's original title, The Man I Killed, was changed to The Fifth Commandment to avoid giving wrong impressions in the minds of the public about the character of the story. It ultimately was released as Broken Lullaby.