Bummer Summer is Ann M. Martin's first novel.

[1] The central character, Kamilla Whitlock, who is known as "Kammy" or "Kams" lives with her father, Robert Whitlock, and a housekeeper named Andrew Croswell, in a sleepy east coast town.

His new wife, Kate, who is nineteen years younger than he is, has a three-year-old daughter named Muffin and an unnamed son called Baby Boy.

She also unfortunately meets a new archenemy, Susie, who considers herself "Miss Perfect," and tries to outstrip everything that Kammy does.

But Susie alone can't ruin Kammy's summer-her summer turns out to not be so bad after all.