Hugo, a vain clothing buyer, meets Myriam on a train and pursues a relationship with her. He is delighted to learn she is a prostitute and has no idea she has more in mind than Hugo bargained for.

It is the summer of 1958 in wealthy Lake Geneva, where an enigmatic young Frenchman begins an affair with a beautiful starlet under the watchful eye of her flamboyant elderly mentor. But in a season full of secrets, is truth the most elusive passion of all?

A journalist wrongly accused of murder enlists the help of a femme fatale to track down the real killer.