Cara travels through an underground world to the court of the centaur king as she tries to discover the secret of the enmity between unicorns and delvers, while on Earth, Beloved and her hunters make plans to destroy the unicorns.

When Phoebe meets a unicorn named Marigold who grants her one wish, Phoebe wishes Marigold would become her best friend, and the two set off on adventures big and small.

Phoebe navigates the challenges of school life with a little help from her unicorn friend, who is always ready with the perfect spell for the occasion. But as the magic spells mount up, both Phoebe and Marigold find themselves wondering if sometimes they might be taking things just a little too far...

As Beloved and her Hunters begin the final hunt for the unicorns by ripping through the Axis Mundi into Luster, the magical world begins to collapse from the wound and Cara seeks the help of Graumag the dragon and other friends across Luster for a final and decisive confrontation with the Hunters.

Having jumped into Luster, the land of unicorns, Cara makes a perilous journey to bring back her grandmother, The Wanderer, in order to release the Queen of the unicorns and allow her to die.

Unicorn princesses Sunbeam and Moon start a show choir, inviting everyone in the enchanted Rainbow Realm to join, including human friend Cressida.

A curious, science-minded unicorn and a fiery horse become unlikely allies as they defend their magical home from a pumpkin-headed menace and a fairy of dubious integrity.

When sisters Even and Odd are trapped and unable to return home to the mundane world they live in, they, with the help of a unicorn named Jeremy, must stop a power-mad wizard from creating an ecological disaster.

"When your best friend is a unicorn, every day is a stroll down the red carpet. Phoebe Howell's unicorn BFF, Marigold Heavenly Nostrils, is happy to provide the celebrity treatment -- teaching Phoebe fancy new spells, giving her a ride to school so she doesn't have to ride the bus, and even negotiating with the tooth fairy on her behalf. But when Phoebe starts noticing that unicorns have become a trendy fashion statement, she doesn't feel quite so...

Mira and her unicorn BFF are struggling during the Unicorn School Field Day when they discover a series of mishaps that make them wonder if everyone is playing fair.