It may not be pure gold but it is worth warbling over. The characters in Mildred Lawrence's teenage romances are the most believable you can find in this genre and Binnie Brannon is no exception. She's from a well-to-do New York family, she's smart, she knows her way around, but she's vulnerable too. Her trademarks--long hair that she can hide behind, and a guitar that she plays and lugs around as Linus trails his blanket--would have stereotyped her if they weren't so revealing of her insecurity under her poise. It hurts when her parents tell her of their impending divorce, so Binny flouts both of them, turns down the colleges of their separate choice (a debutante school and Radcliffe) and heads for her Aunt Kit's home in Alhambra, Fla. and its new Junior College. The small town life, the frumpy girl designated as Binny's companion, the group of teenagers that befriend Binny, their protracted search for a legendary treasure, and their activities on behalf of the school and Aunt Kit's civil projects are what help the girl to find herself. The background isn't Miss Lawrence's best, but Binnie is about the most uptodate teenager around.