Anna Lucia Bell believes in luck: bad luck. Bad luck made her best friend stop talking to her. Bad luck caused her parents' divorce. Bad luck is forcing her mother, Miriam, to sell the family's beloved bookstore. And it is definitely bad luck that Anna seems to be the only person in the world Miriam is unable to recommend a life-changing book.

When Anna finds out that she and her mom are spending two months in a New England seaside town called Rockport, she expects a summer plagued with bad luck too. But Rockport has surprises in store for Anna, including a comet making its first appearance in over twenty years and two new-but familiar-friends.

In what will prove to be the most important summer of her life so far, Anna learns about love, herself, and the magic that an ordinary summer can bring.