Gretchen Rubin seemed to have it all a few years back. She was a graduate of Yale Law, had established herself as a bestselling author, was happily married to her law school sweetheart, had two beautiful girls, lived on Park Avenue, and also happened to be the daughter-in-law of Robert Rubin, the fantastically wealthy former co-chairman of Goldman Sachs and Treasury Secretary under President Clinton. (Bonus!) And yet she still wasn't happy. So, naturally, Rubin took a year off to clear up her "midlife malaise."