Which Tolkien work tells the story of Túrin Turambar in an expanded standalone form?

The Children of Húrin tells the story of Túrin Turambar in an expanded standalone form.

Christopher Tolkien edited the book from his father’s writings, and HarperCollins published it in 2007. The narrative follows Túrin, the son of Húrin, whose life is shaped by the curse laid upon his family by Morgoth, the first Dark Lord.

The story belongs to the First Age of Middle-earth and is one of Tolkien’s great tragic legends. It includes Túrin’s exile, his time among outlaws, his battle with the dragon Glaurung, and the devastating consequences of mistaken identity and fate.

Earlier versions and substantial portions had appeared in publications such as The Silmarillion and Unfinished Tales. The 2007 volume is distinctive because it presents a continuous edited narrative rather than a brief summary or collection of fragments.