(Hardback)

As the colonies continue their battle for independence, Ambrose and John Clark, 15-year-old twins, strike out on another secret mission during the American Revolutionary War in Submarines, Secrets, and a Daring Rescue. Join the brothers as they man a mission on one of the first submarines and bravely attempt to rescue prisoners of war.

(Hardback)

When Revolutionary War Patriot Lamberton Clark is shot by the British, he enlists his twin 14-year-old sons to get a secret letter to General George Washington. Upon discovering that their father is a spy for the Culper Spy Ring, John and Ambrose set off from Connecticut to New Jersey to find Washington and meet up with danger along the way.