There are 2 books in the The Eight series. The newest book is The Fire which came out in 2008.

1
The Eight

Book cover of The Eight
A fantasy novel from the author of A CALCULATED RISK. The secret of the Eight is a puzzle whose solution has challenged the most brilliant minds known to humanity. Catherine Velis is manipulated into using her unrivalled problem-solving skills to find and reassemble to legendary chess set.
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2
The Fire

Book cover of The Fire

Twenty years ago Katherine Neville's groundbreaking thriller THE EIGHT was a global bestseller - a thriller in the style of THE DA VINCI CODE way before Dan Brown ever got there...

In this long-awaited sequel, Alexandra Solarin, a chess-wizard and the only daughter of Cat Velis, the heroine of THE…