Madelyn and her twin sister Annette are normal French 15-year-olds. However, Anne has a minor case of OCD that she is slowly overcoming. OCD causes you to obsess over little things. For Anne, she ca't stand crooked objects. They attend school with straight A's and close friends, but their lives change drastically when their worst nightmare comes true: murder. How will they solve it? Will they solve it? They'd better, for lives are at stake.