In 1972 a disgraced college professor and a retired FBI agent set out to discover, once and for all, the final resting place of the legendary Treasure of the Knights Templar. Days later, both men disappear without a trace. Forty years later, spurred on by the discovery of a long lost manuscript, the Professor's son hires historians Paul Davenport and Sara Walsh to pick up where his father left off. Their adventure leads them from Benjamin Franklin's Freemasons to the early days of the Civil War, from World War II Paris to the corrupt world of J. Edgar Hoover's FBI. But Davenport and Walsh...