Complete and unabridged, with 57 full-page plates by Claude Monet, Fernand Léger and Eugène Louis Boudin. Arsène Lupin against a secret hidden in the chalk of the Normandy coast, and a schoolboy detective who works it out first. Leblanc built the puzzle on a real cliff at Étretat and on documents about the French crown treasure; the solution is the best he ever devised. This edition adds 57 plates of painting, among them Boudin, Gauguin and Corot, plus two restored and coloured illustrations, in Alexander Teixeira de Mattos's translation.