Vanished by the Lake
Le mystère du lac (original)
Homicide Detective Lise returns to her hometown for the first time since a local tragedy shattered her teens. Tragedy strikes again when a teenage girl vanishes under circumstances that mirror the disappearance of Lise's two best friends, Ana and Marion, fifteen years earlier: an unsolved case. Convinced there is a connection, Lise is determined to find the missing girl and answers to the past.
Starring Lannick Gautry, Claire Borotra, Philippe Duquesne, Marie-Anne Chazel, Armelle Deutsch, Jackie Berroyer, Laurent Bateau, Barbara Schulz
Watch "Vanished by the Lake" on Channel4 released in 2015. It's a mystery show, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of show, and is currently available to watch for free.