History's Kid Heroes The Top-Secret Adventure of John Darragh, Revolutionary War Spy by Peter Roop and Connie Roop Adapted by Amanda Doering Tourville illustrated by Zachary Trover

The Quaker Darragh family, who resided in British-occupied Philadelphia, lived across the street from General Howe's British Headquarters.  Even though they were opposed to violence, they worked together as a family to spy on the British.  Since their oldest son Charles had enlisted in Washington's army, they justified their spying to keep Charles safe.  Mr. Darragh created a code.  Mrs. Darragh hid the messages in her son John's buttons.  John would then walk to Washington's camp to deliver the buttons/messages to Charles.
This book creates a story about what may have happened as John carried the messages to Washington's camp.
In the afterword the authors explain how Mrs. Darragh played a major role in preventing the British from attacking American forces.
Very interesting!
-Borrowed from the library.
*There seem to be a couple more book in this series  focusing on kids who helped in the Revolutionary War.