The second, "The Fire Within" (1963), is perhaps Malle’s most disturbing film. Maurice Ronet stars as a self-destructive writer on the brink of killing himself who spends the last twenty fours of his life reconnecting with old friends. It’s a penetrating study of social deterioration and decay that will haunt you for quite a while.
If you enjoy the above films, I'd also recommend some of Louis Malle's other work:
"Murmur Of The Heart" (1974)
"Lacombe Lucien" (1971)
"Au Revior Les Enfants" (1987)