Iris takes her role as Unicorn Guardian very seriously. So when a local newspaper article talks about magical unicorn horns, she is extra careful about keeping the unicorns' secret. But then a news reporter comes to Magic Moon Stable. He insists there are real unicorns there. And he is determined to find a unicorn horn that he can sell for lots of money. Can Iris and her sister Ruby outsmart the reporter? Can they keep the unicorns safe? There are unicorns behind Magic Moon Stable, but no one knows they exist except Iris and Ruby. As Unicorn Guardians, the two girls must protect the unicorns to keep them safe from the outside world.