Holding Up the Universe is about Libby, the fattest teen in America, and Jack, who is face blind. Libby was the fattest teen in America, weighing around 652 pounds. She had to get cut out of her house after having a panic attack 3 years prior to the current day. She lost around 300 pounds. She still has 190 to go. Libby is starting high school for the first time. Libby is going back to school since she left in the 5th grade. (Libby is in the 11th grade.) Jack is face blind which means he can't remember anyone's face even the people he loves. Everyone is a stranger to him. The whole story revolves around Jack and Libby after Jack "Fat Girl Rodeos" Libby. 
 I loved the book! It was so funny and romantic. It has real world problems in the book, and I learned a new disease called prosopagnosia. Niven writes the book in such a creative way, and I love her work.