In the bustling heart of Vienna, a young woman named Margherita finds herself caught in a whirlwind of emotions and secrets. Following her mother's death, she has taken control of the family business of a traditional horse-drawn carriage, but her life takes an unexpected turn when one night she discovers a mysterious passport that reveals her mother’s connection to an enigmatic aristocrat, a certain Count Ludwig. Intrigued by her past, Margherita decides to investigate, which leads her to a series of unexpected encounters with peculiar characters in the city.
As she roams the streets of Vienna, Margherita meets a young journalist who becomes obsessed with her story and becomes her ally, risking his own career in the process. Together, they uncover a web of espionage involving various factions vying for power behind the city's walls. Tension mounts as they begin to follow the leads that take them to a hidden secret that could change their lives forever.
Amid forbidden romance and political intrigue, Margherita must decide whom to trust. As time ticks away, danger looms over them, and her family’s history intertwines with her future. Will Margherita emerge victorious from this crossroads and finally uncover who her mother truly was?