A pair of British female codebreakers formerly at Bletchley Park help American cryptographers solve murders overlooked by the police in San Francisco.

Tells the story of the best code breaker the USA ever had and how he and a small team within NSA created a surveillance tool that could pick up any electronic signal on Earth, filter it for targets, and render results in real time.

A battle-weary Marine is assigned to guard--and ultimately befriends--a young Navajo soldier who has been trained to be a code talker. This code, the Navajo code, and the men who knew the code, were to be guarded as they went into action. It was the unspoken duty of the Marine to kill the Navajo soldier before he could be taken prisoner of war by the Japanese. This is the one wartime code that was never broken by the enemy.

When respected American religious symbology expert Dr. Robert Langdon is summoned to the Louvre by French Captain Bezu Fache, he soon discovers that he is the number 1 suspect for the murder of a historian Langdon had been scheduled to meet with. Assisted by a French cryptographer and government agent named Sophie, Langdon is challenged to decipher a chain of cryptic codes and puzzles, all the while trying to stay ahead of Fache's lawmen in a chase...