Wow! Looks like How Shall I Tell My Husband? is not available on any streaming services in the world!

The film starts in the fashionable seaside resort on the Baltic, Heringsdorf, where Renate Müller spends a secret weekend away from her husband with her bosom friend Ida Wüst. The husband meanwhile has a flirtation while traveling by night train from Frankfurt to Berlin, nice atmospheric shots of sleeper and dining car in the morning. The action continues in the luxury villas and apartments of Berlin, Renate Müller wears a string of very elegant outfits. Misunderstandings, jealousies, temporary separation of husband and wife, a few songs, wicked humour.