The folks who live in the teeming tenements lining Manhattan's Tenth Avenue could sure use an angel. And they have one -- Flavia Mills, a little girl with big dreams who touches the lives and hearts of everyone in her run-down neighborhood. Margaret O'Brien plays Flavia with the endearing earnestness that made her the leading child star of the 1940s. A host of MGM stalwarts take other roles: Angela Lansbury as Flavia's aunt, Phyllis Tha
