Sarah Thomson and Marco Donato's complicated love affair continues - their passion is a deep one but both have been badly hurt before and are wary of exposing their vulnerabilities to the other. Meanwhile, Sarah begins to research a new subject... It's the Roaring Twenties and Katherine Hazleton is determined to be a star. Escaping her rigid upbringing in the Home Counties, she travels to Weimar Berlin, getting a job as a wardrobe girl at Max Reinhardt's theatre. One of the theatre's stars is a young Marlene Dietrich. Inspired, Katherine decides to reinvent herself as Kitty Katkin. Writing her own bawdy songs to accompany her risque dance routines, Kitty is soon a sensation. She is in love with Berlin and her handsome musician lover, Josef. But Germany is about to change. Will Kitty and Sarah find the love they truly deserve?