NEED TO KNOW

Dan Brown's The Secret of Secrets hits shelves on Sept. 9 and PEOPLE has an exclusive sneak peek from Chapter 1

The book, which has been called Brown's "most ambitious novel to date" follows symbologist Robert Langdon to Prague

Read and listen to an early excerpt from the prologue of the book, below

Listen to an excerpt from Chapter 1 of 'The Secret of Secrets'

Katherine's lecture last night had been standing room only, no small feat considering she had spoken in Prague Castle's legendary Vladislav Hall — a cavernous, vaulted chamber used during the Renaissance to host indoor jousting competitions with knights and horses in full regalia.

The lecture series was one of Europe's most respected and always drew accomplished speakers and enthusiastic audiences from around

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