Teen Jacob Portman thinks his grandfather's implausible stories about his stay at a children's home on a remote Welsh island were just stories, but when he travels to the island with his father, he finds that there was much more to his grandfather's life story than he could have ever guessed.
I don't want to give too much more of the plot away than that - read the book! It's a marvelous debut, and I will await Riggs' next book with much anticipation.