Seeds of America trilogy

After being sold to a cruel couple in New York City, a slave named Isabel spies for the rebels during the Revolutionary War. "As the Revolutionary War begins, thirteen-year-old Isabel wages her own fight...for freedom. Promised freedom upon the death of their owner, she and her sister, Ruth, in a cruel twist of fate become the property of a malicious New York City couple, the Locktons, who have no sympathy for the American Revolution and even less...

"As the Revolutionary War rages on, Isabel and Curzon are reported as runaways, and the awful Bellingham is determined to track them down. With purpose and faith, Isabel and Curzon march on, fiercely determined to find Isabel's little sister Ruth, who is enslaved in a Southern state"--