The Warsaw Protocol

Its place in Cotton Malone

The Warsaw Protocol is book 18 in the Cotton Malone series. It follows The Malta Exchange. It is followed by The Kaiser's Web. 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…