His 1984 novel Murder in Memoriam forced the French government to try Nazi collaborators, led to a life of imprisonment for Paul Touvier and made President Mitterrand declare 16 July a day of national reflection on fascism and racism.
Buy it - read it!!!
As I recall, even after Meurtres, it was hard to get cooperation to find documents. There was a bit of my own research that involved putting together figures of Parisian darkness, criminality and the great and the good between the 1930s and 1950s. I was trying investigate the pre-war fascistic prefet Chiappe (he died in a plane crash up to some dirty business for Vichy in 1940) and associate him with the post war 'heritage' of Papon et al, and the librarians at the Bibliothèque Historique de la Ville de Paris were utterly obstructive, claiming that, if my interest was music hall, they had no reason to get me out dossiers on the Police! Daeninckx's novel, as well as being a real thriller, was an immense support.
The first really public coverage I recall was a section of the Pompidou Centre exhibition Face à l'Histoire of 1996 but by then the barrage of silence was broken.
Read Kristin Ross, Fast Cars, Clean Bodies - Decolonization and the Reordering of French Culture, 1995
However it's worth recalling that the City of Light has long been, second to none, the City of Bloodbaths.