This is a more realistic take on the Arthur legend, told by a young woman named Gwynna, a slave who becomes the servant of Myrddin. Throughout her life with Myrddin she passes off as the Lady of the Lake, a boy solider, and a handmaiden for Gwenhwyfar (Arthur's queen).
There were some plot holes of sorts, the fact that Gwynna keeps switching between being a boy and a girl and yet no one seemed to question it was sort of weak. Plus, Arthur comes off as really horrible. Those problems aside, the story itself was pretty strong, so I give it a maybe.