The second feature-length documentary by Guillaume Massart, DETENTION made its World Premiere at the Cannes Film Festival 2026, as part of the ACID selection.

“An implacable documentary on the failure of the prison system, told from the inside” - Les Inrocks

“A sharp, politically-charged film that is as much in the footsteps of Frederick Wiseman as Starship Troopers.” - SoFilm

“A bold and captivating film.” - AVoir ALire

"The strength of the documentary lies in this tension: managing to build an empathetic relationship with the students as well as with certain teachers, while simultaneously exposing the dead ends of the system." - Critikat

The film is distributed in theatres by Les Alchimistes, with sales handled by Andana Films.

A production of TS Productions and Triptyque Films