The Lost Symbol is the third installment in Dan Brown's Robert Langdon series. This conspiracy mystery takes place in Washington, D.C., where Langdon is summoned to unlock the secrets of the Freemasons. As he navigates through hidden chambers, ancient symbols, and cryptic clues, Langdon unravels a mystery that could change the course of history. With the clock ticking and powerful forces working against him, Langdon must decipher the hidden meaning behind the symbols to save a dear friend and prevent a devastating revelation. The Lost Symbol is a thrilling and intellectually stimulating read that will keep you guessing until the very end.