Thread:NikkiNicks/@comment-25373290-20180411064420/@comment-25373290-20180419190952

It's called Witnesses (Les Temoins, french title) and the lead actor is Marie Dompnier. They made 2 seasons, the 2nd was very different but just as good as the 1st. It may still be on the BBC iPlayer, if you can get that to play things for you from over there.