You can file this under Erotomaniac Nightmare, along with Fatal Attraction and Enduring Love.
An attractive Parisian book restorer (Isabelle Carré) goes into hospital with a broken leg and comes out traumatically obsessed with the married surgeon (Gilbert Melki) who operated on her.
For a while, writer-director Michel Spinosa involves us in the psychological cat-and-mouse game between stalker and victim, but, as the title suggests, this is more of a case study than a thriller. Carré is frighteningly good as Anna and the final few frames are marrow-chilling. But a half-hour shorter and it would have been twice as potent.