当15岁的安娜贝尔被送到孤儿院时，她和另外两个孩子一起逃跑，希望在她贪婪的邻居Bo Gilmer带走她的农场里的动物之前拯救它们。到达农场后，安娜贝尔和孩子们发现了一个新的生物——一只神奇的独角兽。当孤儿们试图确定这只神秘的野兽的目的时，他们被博和孤儿院古怪的校长克洛里斯母亲顽强地追捕。同时，娜塔莉，一个富有同情心的社会工作者，调查了这个孤儿的过去，发现了一个可能永远改变安娜贝尔生活的家庭秘密。

When fifteen-year-old Annabelle is sent to live in an orphanage, she runs away with two other kids in hopes of rescuing the animals on her family's farm before they are taken away by her greedy neighbor, Bo Gilmer. Arriving at the farm, Annabelle and the kids discover a new creature has taken up residence - a magical unicorn. As the orphans try to determine the mythical beast's purpose, they are doggedly pursued by Bo and Mother Chloris, the cranky headmaster of the orphanage. Also, Natalie, a sympathetic social worker, investigates the orphan's past and discovers a family secret that could change Annabelle's life forever.