Coming from a wealthy family, Krystal is finding it hard to adjust to the responsibility of being a Unicorn Rider, so when they arrive in the town of Miramar to investigate the disappearance of seven children, she changes out of her uniform and slips away to explore--and stumbles into a plot to capture the unicorns and their riders.

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.

The Unicorn Riders are competing in the Spring Tournament. When Queen Heart receives an anonymous letter threatening the games, the Riders must act! Can Willow lead the Riders to find the troublemaker before people are hurt?

The people of Haartsfeld are in danger. The Unicorn Riders must find their rightful leader, half-fairy Aveena. But Aveena doesn't want to rule! Can Krystal convince Aveena it's her destiny to be queen?