The Hall of Whispers.

The Hall of Whispers is the most secure location in the Scarlet Lodge headquarters beneath the Eden Theatre. It requires three golden hand keys to open. The Hall itself is a rather small room stocked with books, monitors with an intercom, and a small office desk. After Dr. Austerlitz acquires the Nature of Universes from Victor, he keeps this book in the Hall of Whispers.

Trivia (spoilers)[]

A detail-oriented player will notice the Nature of Universes sitting on a pedestal when first entering the Hall of Whispers. After the player picks up the Chaos Key to enter the quarters, the book is gone, foreshadowing Jonathan's secret mission of re-acquiring the book and returning it to Amanda.