Basically the Dutroux case, but romanced from an obsessed young cop's viewpoint. It feels more about his descent into madness than the actual case. It also diverges a lot on some points.

His obsession makes sense, specially after the girls are found dead when he was sure that he heard them and everybody told him to quit. It becomes madness when he's telling his wife she killed them when asking him to stop. But he's a bit caricaturally impulsive, knowing no subtlety or compromise to affirm his ideas, which is a bit annoying after a while.

It is way too long. The 15 minutes wedding scene for instance, when nothing has happened yet in the story, is unbearable. It's a bit better when it finally focuses on the case, but it's still typical police investigation movie. Well, not exactly typical since they're not allowed to really investigate, which makes it a bit slower, but overall basic stuff.

A weird thing toward the ending, they send [spoiler]cops to kill him, and he, if not kill, severely injures one. Wouldn't that be noticeable ?[/spoiler]