When Christa Linz is reprimanded in class, forgets to do her homework, and has to have a cavity filled, but her twin sister Betsy has no such bad luck, Christa begins to wonder if they really are twins.
Susan Beth Pfeffer was an American author best known for young adult and science fiction. After writing for 35 years, she received wider notice for her series of post-apocalyptic novels, officially titled "The Life as We Knew It Series", but often called "The Last Survivors" or "Moon Crash" series, some of which appeared on The New York Times Best Seller list.