Desc: Le secret de la grotte: Directed by Christelle Raynal. With Élodie Varlet, Samy Gharbi, Anne Girouard, Nicolas de Broglie. A well-known local resident is found murdered, killed by a piece of stone chiselled over 40,000 years ago. Leading the case, Riad Lekcir has to work with his opposite number from the investigation unit, Manon Ferret-Duval. A partnership he would have preferred to avoid given the painful links between them.