Patriots, Redcoats and Spies — Robert J. Skead

When Revolutionary War Patriot Lamberton Clark is shot by British soldiers while on a mission for the Continental Army, he has only two hopes of getting the secret message he's carrying to General George Washington: his 14-year-old twin boys John and Ambrose. Upon discovering that their father is a spy in the Culper Spy Ring, the boys accept their mission without a clue about what they may be up against. They set off from Connecticut to New Jersey to find General Washington, but the road to the commander-in-chief of the Continental Army is full of obstacles; including the man who shot their father who is hot on their trail.