The Jefferson Key

Its place in Cotton Malone

The Jefferson Key is book 7 in the Cotton Malone series. It follows The Emperor's Tomb. It is followed by The Admiral's Mark. See the full Cotton Malone reading order.

Cotton Malone is a former Justice Department covert operative (a 'Magellan Billet' agent) who retired to run an old bookshop in Copenhagen, only to keep getting pulled back into the field by his old boss Stephanie Nelle. Each novel sends him chasing a real historical mystery or lost treasure — the Knights Templar, the Library of Alexandria, Charlemagne's tomb, the Romanov dynasty, the Nazi underground, the founding-era secrets of the U.S. Constitution — and ties it to a present-day conspiracy involving…