The show's atmosphere draws inspiration from major fantasy-crime series such as Twin Peaks and Jordskott, blended with a traditional French polar (crime thriller) feel.

The series was mainly filmed in the Hautes-Vosges region around Gérardmer, with the town hall of Gérardmer used as the exterior for Villefranche's town hall.

The sawmill seen in the first episode is the real Scierie Lemaire in Moussey, while the bar set is located at the gîte du Schmalick in Ban-sur-Meurthe-Clefcy.

The scene in which a baby is thrown into a waterfall was shot across three different locations: the Saut du Bouchot, Menaurupt, and Sapois.

Several aerial shots feature the road at the Col de la Schlucht, notably a specific spot known as 'la Roche du Diable' (the Devil's Rock).

Some Belgian scenes were shot at the Quenast quarry in Hainaut, with the courthouse filmed at Brussels' Royal Library (Albertine) and the library scenes shot at the Université de Bruxelles.

Scenes near the Thy-Marcinelle factory in Marcinelle and Marchienne-au-Pont were used to show blast furnaces, and the season 2 opening scene was filmed near Viroinval at a ski station on route N990 that no longer exists today.

Producer Vincent Mouluquet explained the choice of the Vosges region for filming by saying they wanted to show audiences an unusual and rare richness of landscapes, atmospheres, and panoramas rarely seen on screen.

In November 2017, Amazon Prime acquired global streaming rights to Season 1 outside Denmark, Belgium, the Netherlands and Luxembourg, marking a first for any French television series.

At the 2017 Festival TV de Luchon, the series won awards for Best Male Newcomer (Hubert Delattre), Best Director (Thierry Poiraud and Julien Despaux), and Best Cinematography (Christophe Nuyens); in 2019 it again won Best Cinematography for Christophe Nuyens and Brecht Goyvaerts.