While she was jogging Lisa Campion , the daughter of the retired police officer Fabio Campion , discovered the frozen corpse of Julien , a child who disappeared 20 years ago.The police officer Simon Beauregard is then sent to Roches Noires , a village of the Tarentaise Valley, for the criminal investigation.

Simon, a burglar on probation, agreed to go on the biggest shot of his life: The flight of the "Florentine", a mythical diamond set auction by its owners. To succeed, he must approach Julia, expert diamond for sale which is a considerable personal and family issue. Beyond a jigsaw particularly daring, Julia Simon will lead to a destiny she could not imagine.

Laura, Eve, Anouch and Yaël are four cousins, very different and very endearing, who have one thing in common: they lie, but always for love! When the first three discover a few weeks before their little cousin's wedding that her perfect fiancé is cheating on her, they vote in unison "Don't tell him"!