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The author's aim was to read the Book of Isaiah just as he might read any other book. Although it may be useful to identify the ‘three Isaiahs', the advantage may be limited if in so doing, we lose sight of the book's unity. Focussing on the pivotal chapters 36-39, Joëlle Ferry reveals a two-part structure, which was created by the final drafting, and is no doubt more pertinent for those who wish to grasp the global meaning of the book. After outlining the architecture and tracing some paths and avenues, the author ‘travels' through the book, following the literary and theological paths it unfolds. The paradoxical thematic of the hardening of the heart is a narrative inviting reader-listeners to make the choice of faith. The theme of justice runs through the text like a path: from moral justice which must be observed, to the gift of salvation which is to be received. The enigmatic figure of the servant is invested with diverse realisations, inviting the reader to join the ‘we' group that is discreetly present from the beginning of the book. As for the figure of Sion, it takes on various significations while constructing the unity of the book, which might be defined as a tragedy about the relations between Yahweh and Zion. There are few recent publications in the French language about the Book of Isaiah. We are grateful to the author for taking into account the extensive research on prophetic literature completed in English-speaking countries.