'The treasure hunt,' Vittoria said, following closely.

'Remember how I told you about the Path of Illumination? How the Illuminati recruited new members using an elaborate test?' He started briskly down the first aisle, examining the indicator tabs of each vault. He still couldn’t fathom that he was standing in this room. 'So, Professor, what’s the name of this Galileo thing we’re looking for?' She put her hands on her hips and surveyed the enormous space. 'Sure,' she said, apparently letting it go. 'Those indicate secondary documents located elsewhere with their primary themes.' 'Which is why they cross-reference with proxy markers.' Langdon pointed through the glass to the colorful plastic tabs inserted among the documents. 'But data can relate to multiple themes simultaneously.'

All in one place… encouraging a deeper understanding of a topic. Historical accounts, letters, artwork, socio-political data, modern analyses. That’s this vault’s theme.' It was all here, he realized. 'Everything in this vault,' Langdon said, feeling more confident now, 'centuries of material, has to do with the Crusades. The Vatican Archives, it seemed, were cataloged on a similar philosophy. He had always urged his students to understand the overall tones and motifs of an artistic period rather than getting lost in the minutia of dates and specific works. This may be the shrewdest cataloging I’ve ever seen. 'Sounds inefficient.'Īctually… Langdon thought, considering it more closely. 'Thematic?' Vittoria said, sounding like a disapproving scientist. 'I think it’s a thematic classification.' The documents spanned centuries, but all the keywords, he realized, were interrelated. 'Looks like the Vatican has its own system.' Langdon felt precious time already slipping away.

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