This was a tricky, complicated, and maybe at the end implausible French thriller, although I enjoyed reading it. The plot involves the disappearance of children in a small village 20 years apart. The cases are fairly obviously connected, although exactly how forms the basis of the plot. Unusually, the investigators are members of the gendarmerie, the current local captain and a retired officer who investigated the original disappearances. Best not to say more for fear of spoilers. A reader will probably enjoy it, but maybe at the end think that the solution is a little too far fetched to be convincing.