Time Hop customer Clara Barton takes Fiona and Finley on a journey back to the Civil War, where they help her care for wounded soldiers.
Harriet Tubman stops in and tells Fiona and Finley about the Underground Railroad. Fiona and Finley don't just want to hear about it, they want to help.
Fiona is ready to quit her school's model rocket club. Things start to look up when Amelia Earhart stops by the Sweets Shop and whisks Fiona and Finley on a historic flight across the Atlantic Ocean.