Join the Stonehart siblings on their next fantastical journey, which immerses them into the secrets of the Underground Railroad in the mid-1800s, when enslaved people are seeking freedom and a better life. In this episode they meet twin girls with secrets of their own, who need help to be reunited with their parents. Together, the Stoneharts pool their knowledge and talents to devise a rescue plan, but not without encountering threats. How will they manage to deliver the twins to their ultimate destination of freedom without risking their own lives?