This is French horror at its sadistic best. House of 1000 corpses meets Hostel meets Texas Chainsaw Massacre. Relentless, fast paced action driven by sick/slick characters and by a moody, ominous, sepia-drenched camerawork that makes you want to pause and step out of the room for a breather.
Gory but not gratuitously violent, this is Xavier Gens' tour de force, a claustrophobic gorefest of a movie that ranks up there with the best of the genre.
Shame the director went from flop to flop after Frontier(s).