Wikipedia
Shadowmarch
Shadowmarch is the first novel in the Shadowmarch tetralogy, by Tad Williams. It was released in hardcover on November 2, 2004, and in trade paperback on November 1, 2005. A paperback edition was released in September, 2006. The second book in the series, Shadowplay was published on March 6, 2007 in hardcover and on March 4, 2008 in paperback in both the USA and the UK. The third book in the series, Shadowrise, was released in hardcover on March 2, 2010. The last book in the series, Shadowheart, was published in hardcover on November 1, 2010.