Orion and her brother Ollie think it's just a funny, old mirror, until they see the reflection of a girl who isn't really there. Not only that, she looks like somebody from another time. With neighbors Sal and Sofi Martelli, they learn the story of Susanna Chase, who escaped from slavery on the Underground Railroad in 1860. Susanna was waiting for her father to run away from his master and go with her to Canada, but she died of the measles before...