Emily and her companions, including the winged horse, Pegasus, must confront a legion of Olympic enemies in this third book of an action-packed series. When Emily's father and the goddess Diana return from a visit to Earth, they bring with them disturbing news. There's a horse called Tornado Warning that's winning all the races, with times faster than anyone's ever seen. What could this mean? Emily, Joel, Paelen, Pegasus, and the sphinx...