A lonely criminology professor attempts to solve the mystery behind five murders by decoding the puzzle of five Pythagorean theorems, in a crime story that features renowned French actor François Cluzet in a key-role.

The doorbell rings. A mysterious woman opens the door. George is only trying to do his job, but things go terribly wrong.

All kinds of people are waiting in seven different queues. The first person of each queue becomes the last of the next one, thus creating an enormous human line. But at the end of the line, it all begins backwards again.