Is the show Turn based on a true story?

The AMC series "Turn" is based on the 2007 book "Washington's Spies" by Alexander Rose, which tells the true story of the Culper Ring, an espionage ring operated by General George Washington during the American Revolutionary War. The show follows the activities of the Culper Ring, which was active from 1778 to 1783 and was instrumental in providing Washington and the Continental Army with valuable intelligence about British military plans. The show takes some creative liberties with the historical record, but it is generally faithful to the events and people involved in the Culper Ring's operations.