During France's belle époque before World War I, elegant cars, mansions, and servants defined the lives of les grandes horizontals, the courtesans of kings and millionaires. One of the most successful, Lea de Lonval, is approaching a certain age when an older associate, Charlotte Peloux, asks Lea to take on her 19 year old son, whom Lea has called Chéri since he was a child. They become lovers and, to their surprise, the relationship lasts six years. When it ends abruptly with a marriage his mother arranges to the daughter of another courtesan, Lea finds herself miserable. Has she fallen in love? If so, do she -- and Chéri - have any choices?

This movie is set in the year 2095, hence the presence of mutant humans and extraterrestrials. The main character is known as Jill. She is not human. When she is discovered by Dr. Elma Turner she is diagnosed as being the most interesting genetic test subject Turner has ever come across. Her organs are not in the right place, she has no memory and her internal biological age appears to be only three months old. Turner gives her a break, giving her an identity card and a place to stay, in exchange for Jill being her guinea-pig to work on and discover more about. Nicopol is a frozen prisoner who is due to be released a year after the film is set. There is a problem in the frozen prisoners' ward and several are thrown down to the ground(dying in the process), including Nicopol, but he lives and only loses a leg. There is a lot more to this story but I can't disclose it in this summary; I don't have the words.