The Forgotten Children was the third Ravenloft Netbook published by the Kargatane, a group of Ravenloft fans who went on to run the official fan site for many years. The Crossroads of the Gothic Earth is a catalog of strange characters from the Ravenloft and Masque of the Red Death settings.
From the introduction of the book:
People are the key to Ravenloft. While other campaign worlds are often focused around vicious new monsters, bizarre new magical items, or powerful new spells, Ravenloft's heart and soul is in the personalities and histories of the characters of the setting.
No other setting can boast such a proliferation of information about people. From the many detailed Darklords, to the individual creatures of the Ravenloft Monstrous Compendium II, to the heroes of Champions of the Mists, to the NPCs of the Children of the Night series, Ravenloft is just bursting with fully-realized, interesting characters. It's the motivations and desires of these creations that drives everything that happens in the Domains of Dread.
This netbook details more of these characters. They're not heroes, and they're not Darklords. Some of them don't even fit any of Van Richten's groupings. They are the Forgotten Children.