The Lost Symbol is a 2009 mystery-thriller novel written by American writer Dan Brown. It is a thriller set in Washington, D.C., after the events of The Da Vinci Code, and relies on Freemasonry for both its recurring theme and its major characters.
The Capitol Building, Washington DC: Harvard symbologist Robert Langdon believes he is here to give a lecture. He is wrong. Within minutes of his arrival, a shocking object is discovered. It is a gruesome invitation into an ancient world of hidden wisdom.
When Langdon’s mentor, Peter Solomon – prominent mason and philanthropist – is kidnapped, Langdon realizes that his only hope of saving his friend’s life is to accept this mysterious summons.
It is to take him on a breathless chase through Washington’s dark history. All that was familiar is changed into a shadowy, mythical world in which Masonic secrets and never-before-seen revelations seem to be leading him to a single impossible and inconceivable truth…