Seventeen-year-old Zuretta Palmer travels to Chicago during the 1893 World's Fair to find her missing sister, but when the police and the Pinkertons refuse to help her, Zuretta begins her own investigation by becoming a maid at the notorious Castle.

The trip to Chicago for Griffith, Ruby, and Graham becomes an adventure in itself after they realize their Uncle Owen has gone missing and the Chancellor has set his sights on the money the Travelin' Nine have been trying to raise.

It is 1871 in Scranton, Pennsylvania, and fourteen-year-old Pringle Rose, still grieving from the death of her parents, takes her brother Gideon, who has Down syndrome, escapes from her uncle and aunt, taking a train to Chicago--but disaster seems to follow her there.