Afterwards

Guillaume Musso, the author of the source novel, has declared he liked the film, and praised it for its "poetic, mysterious and dramatic atmosphere", its "constant tension" and its "never-slowing pace".

In the scene where Nathan approaches an ambulance from behind, his feet are reflected in the shiny metal at the bottom of the vehicle's rear doors. Also reflected are the feet of the cameraman following him.

Over the end credits music, you hear an ambulance winding through traffic.