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Non Coupable translates as Not Guilty, which is definitely not the legal standing of provincial doctor Michel Simon. Already on the outs with the medical establishment because of his heavy drinking, Simon exacerbates the problem by inaugurating a clandestine romance. Things go from worse to worst when, after a particularly bibulous evening, Simon plows his car into a motorcyclist, then leaves the scene of the fatal accident. Reasoning that he can only be guillotined once for murder, Simon then goes on a homicidal rampage, killing his mistress' second lover, and then knocking off a rival doctor. Far from being repentant, Simon struts around hoping to be caught so that he'll be praised for the ingeniousness of his crimes. The film's title is elucidated ironically at the end, when the vainglorious Simon, disgusted that the local police are unable to link him with the murders, decides to mail his confession to the authorities-resulting in still another blow to his inflated ego.