The Lost Symbol by Dan Brown (Paperback)

Robert Langdon arrives in Washington, DC, expecting to speak at the Capitol. Instead, he finds a message left for him and learns that a trusted friend has been kidnapped. The symbols left behind point to a long-standing order with a deep connection to the city’s history.

Langdon begins following a trail shaped by hidden architecture, coded texts, and groups who have protected knowledge for centuries. He works with those familiar with Washington’s unseen history to interpret the clues. Each new discovery reveals a wider plan driven by a man determined to reach his goal regardless of the cost.

As the investigation progresses, Langdon realises the stakes involve more than his friend’s safety. The plan seeks access to information believed to hold great influence. Competing organisations attempt to manipulate the outcome, increasing pressure as the search moves through libraries, monuments, and restricted locations.

Langdon must rely on his understanding of symbols to uncover the final meaning before the plan succeeds. The investigation challenges ideas about secrecy, belief, and the value of knowledge hidden in plain sight.