"The Lost Symbol" is an adventure series based on the bestselling novel by renowned author Dan Brown. The show follows the story of Robert Langdon, a young professor from Harvard. He is offered the opportunity to give a small lecture at the Capitol. As events unfold, the main character learns that his mentor has been kidnapped by unknown criminals. But what do they want? In his quest to find the answer, Langdon teams up with his mentor's daughter and embarks on his own investigation. Little does he know where this convoluted case will lead him.