Although this novel comes out a bit from the regular Thilliez (farewell Sharko and Hennebelle), it none the less exciting and terrifying reading. The beginning makes me think of this series irretrievably American film SAW, characters a priori do not know and find themselves trapped in a hostile environment and must be free; Thilliez found even in descriptions of some gory scenes not always easy to read. However, and this is the great strength of this novel, the closed session is experienced through one character and his relationship with his two sidekicks. I saw in some reviews that some were very predictable end, perhaps this is due to my naivety but I have found unexpected and very well made.