Miles and Zoey Montgomery, 9-year-old twins from Baldwin Hills, CA, have different feelings about moving to Houston, Texas after their parents separate. Miles is angry leaving his close buddies while Zoey is excited to finally have an opportunity to make new friends. While trying to adjust to their new life in the house that has been in their mother’s family for six generations, they discover their Family Tree Book in the attic. The mysterious discovery takes them on an exciting adventure that transports the twins back to 1857 where they help a slave travel the Underground Railroad to gain his freedom. While on the journey, Miles and Zoey, not only learn about the era of slavery, they discover their own lessons they can apply in their present-day lives.