A new adventure begins for Elliot and Uchenna when Professor Fauna bursts into their classroom with a frightening report from the Texas-Mexico border: something has completely drained the blood from a cow's body! The team must fly to Laredo, where tempers are running high. Teaming up with local kids Lupita and Mateo--plus their brilliant mother, Dr. Alejandra Cervantes, and her curandero husband, Israel--can the Unicorn Rescue Society save the region's animals and help bring a divided community together once more? And what is that spiny, bloodsucking, adorable little creature?