The Secret of Secrets  by Dan Brown is a thriller set in Prague in winter, featuring Robert Langdon as he becomes entangled in a dangerous quest involving the mysteries of human consciousness, secret organizations, and ancient mythology. When Langdon attends a groundbreaking lecture by noetic scientist Katherine Solomon, she is about to release a manuscript that could disrupt centuries of belief.   Robert Langdon, the hero of Brown’s past novels, is drawn into an international race to unlock...