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Dinard et Saint-Malo sont séparées par un fleuve : la Rance. À son embouchure depuis les années 60, un barrage hydroélectrique. Très vite, le cours d’eau s’est envasé. Riverains, élus et plaisanciers s’inquiètent de l’avenir de la Rance et demandent à la dévaser. Le chantier, longtemps enlisé, tente de sortir la tête de l’eau.