For the women in Candace Bushnell's stellar novel. "One Fifth Avenue" is at the heart of the lives they've carefully established, or hope to establish. Schiffer Diamond, a forty-something actress, is busily proving that women of style are truly ageless; spoiled, self-assured Lola is determined to claw a way into the building; Annalisa is a reluctant socialite; while bitter Mindy, married to an under-published writer, has been the family breadwinner for too long. And then there is Enid, the glamorous grande dame and gossip columnist, who has lived at One Fifth Avenue for decades, and sees everything there is to see from her penthouse view.