Chains (Seeds of America #1)

This is an incredible look at a little discussed topic -- slavery during the Revolutionary War. When Isabel's master dies, she and her sister, Ruth, are sold to Loyalists and shipped to New York City. The only thing that matters to Isabel is that she and Ruth stay together. But, when Ruth is sold in the middle of the night, Isabel does what it takes to find her again, even if it means spying for the rebels.