The two meet when Joachim is sent to finish mounting a set of mirrors at the Paris Opera, and a strange force unites them.

[3][4][5] Donzelli wrote the film's screenplay, in collaboration with Jérémie Elkaïm and Gilles Marchand.

Édouard Weil produced the film through Rectangle Productions alongside Wild Bunch, France 3 Cinéma and Scope Pictures.

[1] Principal photography began on 24 October 2011 in Commercy, a provincial town located in the Meuse department.

[6] The production filmed in the Ménagerie de Verre dance studio in the 11th arrondissement of Paris.