Autumn Ackerman's life was turned upside down when her childhood imaginary friend, Barnaby, returned and Autumn discovered that she is a Night Folk - a race of incredible creatures that inspired all of humanity's myths and fairy tales. Finishing high school and working at the local coffee shop is more than enough for any teenager to deal with, but now Autumn has to learn to navigate a new world of trolls and fairies, dealing with threats like the mysterious Mr. Balloon, and getting to know her estranged grandfather, the October King, leader of the Night Folk. Before Autumn can even get used to all these changes, her life is turned upside down yet again when her ordinary, human father - who she hasn't seen in five years - suddenly returns, exhibiting terrifying new powers... ...powers that threaten everything Autumn holds dear!