Beginning with “The 400 Blows,” director Francois Truffaut made a series of films about the impetuous Antoine Doinel, in which this is the last. Antoine is now 30, working as a proofreader and getting divorced from his his wife. It being the first “no-fault” divorce in France, a media circus erupts, dredging up Antoine’s past. Indecisive about his new love with a store clerk, he impulsively takes off with an old flame.