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Monsieur Perdu has a barge on the Seine, and in that barge he has his bookshop. Actually, rather than being a normal sort of bookshop it is more of a chemist's, since he is something of a literary apothecary, prescribing books to his customers that he senses will soothe their souls, and relieve whatever troubles are ailing them. He only has to speak to them a little, sometimes only has to see them, and he instinctively knows which book will help them. Despite his skills, however, he seems unable to diagnose and resolve his own emotional issues and he is, as the translation of his French surname tells us, Mr Lost.