Magical unicorn horns

"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?"--OCLC.