LONDON (Reuters) - U.S. author Madeline Miller won the Orange Prize for fiction on Wednesday for her debut novel "The Song of Achilles", a Homeric tale of love and friendship. Miller's novel tells the story of Patroclus, an awkward young prince in exile whose friendship with ancient Greek hero Achilles grows into something far deeper. When word comes that Helen of Sparta has been kidnapped, Patroclus journeys with Achilles to Troy, little realizing what awaits. ...