Harry Castlemon 
Marcy, the Blockade Runner [EPUB ebook] 

This volume from Castlemon’s popular War series for younger audiences follows the ongoing saga of the Gray family, which has been torn apart due to divided loyalties during the Civil War. This novel focuses on Marcy Gray, a boat pilot whose nautical skills are in high demand but whose Union sympathies must remain concealed to ensure the safety of himself and his loved ones.