Green Rider

Karigan Galadheon, running away from school, is traveling through a deep forest when a galloping horse pounds up to her, its rider impaled by two black-shafted arrows. With his dying breath, he tells her he is a Green Rider, one of the magical messengers of the King. Before he dies, he makes Karigan swear to deliver the message heas carrying, and gives her his green coat, with the symbolic brooch of his office. Pursued by unknown assassins, following a path only her horse seems to know, Karigan becomes a legendary Green Riderafor when given to the right person, a Rideras brooch awakens the magic insidea].