In this book Simon, Jane, and Barney go on an unexpected quest to find a goblet that tells of King Arthur's times. However, they are not the only ones looking. They are on the righteous side, so people from the dark side are trying to find it before them.
I give this book two thumbs up (9/10), for a good plot, a good page turner, but most of all, the characters. Characters are what make a good book, a good book. If the characters are all perfect, or all snotty (and not funny), then I regard the book as a "not so good book" because without good characters the book and the plot isn't carried out with the same gusto if the book had had great characters!
Good Job Susan Cooper for writing this book!
I highly recommend this book for ages nine to sixteen, for people who like adventure.
p.s. If you haven't read the series, I recommend that you do so.