The ruler of Haartsfeld has died, and it is up to the Unicorn Riders to find his daughter and heir, the half-fairy Aveena, and bring her to her new kingdom before it falls prey to the wicked Duke Bowral--when the fairies demand a price from Krystal, but the real trouble is that Aveena does not want to leave her home in the fairy forest, and it is up to the Riders to convince her of her responsibility to her father's people.