Joshua Run is an African-American lawyer working in Boston. He encounters Born Katherine Aelwen Lin. For the record, she rarely allows “Kate.” Merlin's niece, she currently lives somewhere in America, having fled her home in Wales. She's actually a lot more powerful than she thinks she is, but she can't afford to acknowledge it. It's a terrible but true fact that the Kin - having been already "diluted" from their magical... during the adventures of Half-Shell Prophecies, goes on an adventure from world to world, and ends up gaining more than he loses – but not by much.
He has his own short story set after the book here, but be warned: it’s spoilery.