The Secret Letters of 75

This story is based on a true historical event about The Sons of Liberty, a group of rebels in Boston, 1775, who are determined to drive the British Army out of their city. Their youngest members, Jamie and Sarah, discover letters written in secret code by a British spy. Risking their lives, Jamie, Sarah, and their friend Joshua try to expose him and stop him from informing to the British Army. However, no one will believe that one of the Sons of Liberty and a high-ranking official is a spy. The American War for Independence suddenly erupts, and the teens find themselves swept into a violent revolution. Time is running out. Will they be able to crack the code and stop the spy in time before the British defeat the Americans?