The story follows three brothers, a group of young knights, on their fairy tale themed quest to rid the kingdom of the Witch of the North Northwest. Basically, this is their written "journal" about the adventures they come across during this quest, the people they meet, and a dark past that seems to haunt each of the brothers. I don't know. I think the prologue does a better job of explaining this.
On a side note, because this is supposed to be their "journal", there might be references to writing on pieces of paper and stuff like that, even though there really are no pages, so please bear with me on that!