Based on a novel by Roger Borniche, this crime drama retells the story of the renowned gangster "Pierrot le Fou," whose band of robbers sought out banks and factories in the period just after the Second World War, when the French police forces were in disarray. In the movie, Alain Delon plays Robert, the gangleader, who plans for his gang to perform a large number of major robberies in one day. After that, he and his gang will retire comfortably for a time with the loot. Performed with split-second timing, the robberies go well almost to the end.
~ Clarke Fountain, All Movie Guide