The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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The fourth "Dunk & Egg" story, currently untitled, has been announced by Martin as in the planning stages. It will feature Ser Duncan the Tall and Egg at Winterfell, where they will meet the “She-Wolves” as Martin first hinted at here. Martin has also stated it will be published in a new anthology he is co-editing with Gardner Dozois, titled Dangerous Women.
After the fourth novella is published, Martin indicates that Bantam has signed a deal to republish the four novellas in a collection.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.