Darby wants to visit her great-grandmother, a mysterious healer who lives in the middle of the rain forest. But she's afraid of the dark woods—until she sees a beautiful, elusive pink roan mustang roaming the forest. When Darby finally braves the forest and meets her new neighbors, she uncovers a secret tragedy—one that led to a terrible fight between her two best friends. Can Darby and her great-grandmother mend a broken friendship? Or will the rain forest mustang save the day?