The Unicorn Rescue Society--Elliot, Uchenna, and Professor Fauna--travel to the Texas-Mexico border to investigate a mysterious creature that drained a cow completely of blood. There they meet locals Lupita and Mateo along with their mother Dr. Alejandra Cervantes, and learn the problem is much bigger than they thought. They must find the adorable, blood-sucking creature, save the animals, and bring a community back together.