In Kentucky horse country, two dimensions touch. A portal is created. High school genius Jerry Swift finds a glowing stone on the side of the road, but the school's star quarterback, Andrew Collins, takes it from him calling him a "real horse's ass" in the process, and throws the stone into a cornfield. Jerry's whole world is changed.

The next night he is awakened when his bed collapses and he finds he is now a centaur. On his quest to get his old life back, Jerry quickly begins navigating two worlds. One is of pure myth where magic and the old Greek gods, goddesses and monsters are frighteningly real. The other is in his own world where he risks all in helping his sister in her equine sport of stadium jumping for her Olympic quest, when her horse becomes seriously injured. However, Jerry and his family are not alone in their search for answers and breaking the curse. True to the old saying, "When the student is ready, the teacher appears," Chiron, centaur teacher of heroes, comes to their aid in an adventure fit for a Homeric epic.