The heroine Lara Lington is at a crossroad in her life and serendipitously meets her great-aunt Sadie. While Sadie can be very annoying, she also helps Lara find her way to true love and a successful work life.
While I have read all of the Shopaholic series, I read about "Twenties Girl" Red Vines for Breakfast.
The premise is rather silly but Sophie Kinsella makes it work. I can always empathize with a heroine who struggles with her love and work life! What single woman can't?