Julie is a bubbly young woman but continually unhappy in love. Getting dumped by courier at work therefore seems to be the final blow. But the book "Happiness is learned" becomes her bible and she applies the advice to the letter at work and in love. This new fad of "positive thinking" leaves skeptical her two best friends whose love life is not in good shape either. When one, Louise, has a secret affair with her boss, the other, Rose, endures the daily life of a couple at the end of the race. Having become a regular client of a bookstore where she devalues ??the "personal development" department, Julie will meet there who will perhaps finally change her life ...