A beautiful medical student travels to London to investigate the mysterious murder of her identical twin sister. Taking on her sister's identity, she gets closer and closer to the killer who is determined to finish the job once and for all.

The film follows four families, with different nationalities (French, German, Russian and American) but with the same passion for music, from the 1930s to the 1960s. The various story lines cross each other time and again in different places and times, with their own theme scores that evolve as time passes. The main event in the film is the Second World War, which throws the stories of the four musical families together and mixes their fates. Although all characters are fictional, many of them are loosely based on historical musical icons (Édith Piaf, Josephine Baker, Herbert von Karajan, Glenn Miller, Rudolf Nureyev, etc.) The Boléro dance sequence at the end brings all the threads together.

Juliette is a young woman who just can't help lying. She lies to her sister, Sophie, to Sophie's fiancé Martin, and to all the men she attracts with her womanly charms. But when she falls for an older man, a 40-year old lawyer, her reputation as a liar precedes her and she cannot convince him that she really does love him…

A widow in her fifties,Madame Lacoste ,meets Jean when they both come to put their pussy in a cattery.The man borrows a hefty sum from her ,to send his sick young son to breathe the fresh air of the country ,or so he said;in fact there's no son at all.He gives the money to his mistress who claims she's pregnant by him and who wants to have an abortion.She lies too ,for she does not expect any child and she intends to help the young man she's in love with to buy a scooter.But the latter does not care about her either and intends to marry a "rich " girl ....who's actually the concierge's daughter.

A P.I. is obsessed with a cute woman, who seduces and kills rich men around W. Europe.

Berg and Bela are married stunt drivers, but one night Bela dies in an accident. Jaded and reclusive, Berg becomes a nighttime security guard where he befriends a young woman, Mimi, who works nights too. Soon a shadowy figure from Bela's past comes into Berg and Mimi's lives. Berg is forced to protect Mimi and seems responsible for a murder, but the man from Bela's past who caused her so much pain won't stop until he sees Berg suffer as much as Bela did.

Ariane and Gerhard Christ, a wealthy Munich couple, plan for the weekend on separate trips, lying to the other about their trysts. However, their itineraries are complicated when they both arrive at the family's country home with their respective lovers.