AMC’s espionage series Turn (review) is based on the exploits of the Culper Ring, a loose network of Revolutionary War spies–including one woman–from whom George Washington learned of the movements and plans of the British in and around New York, then in the redcoats’ hands. It was the era of the martyr Nathan Hale, the dashing British spy, Major Andre, and the dastardly Benedict Arnold. And this quiet group of brave patriots. Episodes will air numerous times over the next month, and if the series succeeds, may continue next season. It’s based on the book Washington’s Spies by historian Alexander Rose. A book on the same topic, George Washington’s Secret Six was recently reviewed here.