Daniel Auteuil has so often blessed us with his shrewd, canny and ultimately modern version of what a typically French man is like today. Not the guachely bombastic Depardieu or the suavity of the leading men of the New Wave era.
Unfortunately, Xavier (Auteuil), playing a private eye doesn't really fit into any particular type and neither the script nor he, is individual enough to make him stand out. At least we had Morse, or Wallander to make us want to watch it, when it ran a little slow.
The Lost Son, to my mind, plays more like a TV crime drama; gritty, topical but covering too much ground, and a cast with too much variety for the script to flesh out their characters. There's been a fair few French thrillers recently (though this was released 11 years ago) that seem to be basic thrillers.
The story is wholesome enough, even if the subject of it isn't and is told in a workmanlike fashion. As the film ended, I couldn't help thinking that as a taster, some inkling of the outcome should be in the opening scene and then it all be told in flashback. As it is, the unfolding is quite slow and laborious, especially for a modern audience.