In a story of suspense and intrigue, Anna Strong and the Revolutionary War Culper Spy Ring explores a little-known chapter of American history--and offers readers a mystery of their own to solve!   Travel back in time to the American Revolution in the thrilling third book in the Spy on History series. Discover the secret Culper Ring, a network of American spies fighting against the British redcoats. Meet historical figures like George Washington and the soon-to-be-infamous Benedict Arnold. And meet Anna Strong, an unsung heroine who found ingenious ways to communicate top-secret messages to her fellow spies--helping to free the American colonies from British rule.   Your mission: Decode Anna Strong's hidden message and discover the secret assignment she undertook for the Culper Ring. There are clues embedded in the book's text and illustrations, plus spycraft materials, including a cipher wheel, in an envelope at the beginning of the book.