When her owner dies at the start of the Revolution, a greedy nephew keeps Isabel and her younger sister enslaved and sells them to Loyalists in New York, where Isabel is offered the chance to spy for the Patriots.

As the Revolutionary War rages on, Isabel and Curzon have narrowly escaped Valley Forge, but their relief is short-lived. Before long they 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 where bounty hunters are thick as flies.