Robert Langdon, a famous semiotics expert at Harvard University, was accidentally involved in a bizarre murder case - a physicist was brutally killed, with a mysterious symbol on his chest.As the investigation gradually deepens, Langdon discovers an incredible shocking secret: the ancient organization "Light Society", which was once thought to have long been annihilated in the dust of history, is quietly reborn.This legendary most powerful and mysterious underground brotherhood on earth has surfaced again, and the power and conspiracy it hides may rewrite the fate of mankind.