I did enjoy this series over all, it was engaging with good characters and was at times tense. I do agree with others that the ending was somewhat disappointing. But it was well acted and directed throughout and I will watch the next series.
Sofia Essaïdi and Elisa Ezzedine were both good as Sarah Castaing. Leslie Medina as Lilas Castaing was full of character and a little underused in the story. Olivier Marchal as Pierre Castaing was good until the last episode as others have said, but that was the writing, not his acting.