"Nimona is an impulsive young shapeshifter with a knack for villainy. Lord Ballister Blackheart is a villain with a vendetta. As sidekick and supervillain, Nimona and Lord Blackheart are about to wreak some serious havoc. Their mission: prove to the kingdom that Sir Ambrosius Goldenloin and his buddies at the Institution of Law Enforcement and Heroics aren't the heroes everyone thinks they are. But as small acts of mischief escalate into a vicious...

It all started when Phoebe skipped a rock across a pond and accidentally hit a unicorn in the face. Improbably, this led to Phoebe being granted one wish, and using it to make the unicorn, Marigold Heavenly Nostrils, her obligational best friend. But can a vain mythical beast and a nine-year-old daydreamer really forge a connection?