Secret Agent

From IMDb: During the first world war, novelist Edgar Brodie is sent to Switzerland by the Intelligence Service. He has to kill a German agent. During the mission he meets a fake general first and then Elsa Carrington who helps him in his duty. Stars: John Gielgud, Peter Lorre, Madeleine Carroll and Robert Young Free to stream — public domain / Creative Commons via the Internet Archive. Source: https://archive.org/details/Hitchcock_Secret_Agent