Thriller I read in one go so the plot is panting. Helen Grace commander gives himself 200% to find that particularly diabolical serial killeuse. Each time, the same scenario: it encloses two close people in a room without issue. Alongside a pistol with a single bullet and a cell phone sending them the message "you must kill to live" before dying. The days and nights pass, thirst and hunger assail them. A nightmare from which they never emerge because the survivor will live with his terrible crime on his conscience ...
