Céleste, cancan dancer in a cabaret in Montmartre, has only one obsession: to find her brother and sister from whom she was separated when their father was killed before their eyes. At the same time, Arsène, a talented engineer, has to face an arranged marriage, while Rose, a young whiter, finds herself trapped by the man she loves.
Heavenly does everything to save Rose, seriously ill. Meanwhile, Arsene is caught up in family conflicts but a mysterious letter will come to disturb his certainties. After his bold number to the Pink Elephant, Céleste finds herself threatened and wonders if her sudden celebrity really deserves the sacrifice of her regained happiness.
Celeste must imagine an innovative number to save the Rose Elephant, threatened with closure by the minister following the scandal. Arsène decided to go to America, but Augustine asked for her help to find Octave. Rose, meanwhile, takes risks by posing for an unknown artist from Montmartre despite the warnings of her sister.
Leon accepts that Céleste will accompany him to Saint-Loup to investigate the murder of his father. Octave and Arsène, in search of funds for their electric motor project, organize a clandestine boxing fight. Rose,who thought he knew Charles, discovered his true identity.
As she discovers inconsistencies about her father's death, Celeste is convinced that it is a murder and not a suicide. Rose, caught up in her past, is unmasked by Charles' mother. Arsène, helped by Octave, is trying to break a speed record to save his project and find investors.
While interrogating a former teacher from Saint Loup, Céleste discovers a new suspect who could be linked to the murder of her father. A victim of prejudice, Arsène is about to lose a major contract. Rose learns very good news and is looking forward to writing to Charles to announce.
Celeste and Leon disagree and their couple weakens. Rose does not feel confident with the Countess and decides to leave the castle. For his part, Arsène discovers huge debts in her father's legacy and decides to reconnect with her brother. Meanwhile, Leon realizes that a corrupt colleague could be linked to the investigation of Celeste's father.
Celeste finally discovers who her father's murderer is and puts in place a bold plan to trap him on New Year's Eve. At the same time, Rose breaks into the Countess Castle to save Gustave, risking everything in a clandestine operation. Arsène, meanwhile, is looking for a solution to live his forbidden love story.
