When Pegasus crashes onto a Manhattan roof during a terrible storm, thirteen-year-old Emily's life changes forever. Suddenly allied with a winged horse she'd always thought was mythical, Emily is thrust into the center of a fierce battle between the Roman gods and a terrifying race of multiarmed stone warriors called the Nirads. Emily must team up with a thief named Paelen, the goddess Diana, and a mortal boy named Joel in order to return Pegasus...