Which Tolkien novel was published posthumously in 2007 after editing by Christopher Tolkien?

The Children of Húrin was published posthumously in 2007 after editing by Christopher Tolkien.

J.R.R. Tolkien worked on the story for many years, and versions of it appeared in different forms during his lifetime and in later publications. Christopher Tolkien assembled a continuous narrative from the surviving texts, presenting it as a standalone book rather than only as a section of a larger mythology.

The story is set in the First Age of Middle-earth and follows Túrin Turambar and his sister Nienor, children of Húrin. Their lives are shaped by the curse laid upon their family by Morgoth, the first Dark Lord. The tale has a tragic tone and draws on heroic and tragic traditions that Tolkien studied as a philologist.

The 2007 edition included illustrations by Alan Lee and was released by HarperCollins in the United Kingdom and Houghton Mifflin in the United States. It is distinct from The Silmarillion, where a shorter version of the same story appears.