Avatar: The Last Airbender -- Smoke and shadow

"With the disappearances of children in the Fire Nation Capitol, Avatar Aang and his friends are doing everything they can to find out what is going on. Aang and Zuko must work together to keep the peace, but the emergence of the New Ozai Society and the mysterious Kemurikage from legend appearing may prove to be too much even for the Avatar when the true culprit of the kidnappings is revealed"--Amazon.com.