Langdon explained to her that they symbolized an ancient greeting to learn a Masonic mystery, and the two set off to find where Mal'akh was keeping Peter.
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Sato came to investigate, and immediately began to question Langdon about the symbols tattooed on Peter's hand.
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Capitol Rotunda room, and was met with the sight of Peter's hand. Sato and Langdon first met when Langdon came to the U.S. Inoue Sato is the Director of the Office of Security for the CIA, and plays a protagonist for most parts of the story, but briefly plays an antagonist role. This revelation completely changes his attitude on life and his take on the Masonic lore and symbolism of Washington D.C. However, during the end events, he comes to realize that not only is Mal'akh's plan completely sane, but that God does exist, in a sense, and so do demons and angels. In the beginning of the story, Langdon was very skeptical of Mal'akh's plan, even thinking that the Masonic Pyramid does not exist. Langdon only escapes with the help of one of Peter's Masonic friends, and begins to run from both Mal'akh and the CIA, all the while decoding the symbols engraved into the Masonic Pyramid. When Langdon forgets to tell Sato that he has the keystone of the Masonic Pyramid in his bag, she orders him to be hunted down and put in custody. He meets the Chief of the Office of Security of the CIA, Inoue Sato, who is less than pleased with Langdon's information. In the book, he must decode the Masonic symbols given to him by Mal'akh, to save his friend Peter Solomon.
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Robert Langdon is the main character and protagonist of The Lost Symbol.