Homer and Bart use fireworks to accomplish things Marge has told them to do: fix a stuck shelf, demolishing Santa's Little Helper's doghouse (while promising him another one would be built by January 2007), and attempting to fix Lisa's VCR, but end up destroying her room with fireworks instead. To make it up to her, the family spends a day at the Springfield Festival of Books for her birthday. There, they encounter famous authors such as Stephen King, Tom Wolfe, John Updike, and Amy Tan. While waiting in line for an autograph from Krusty, Bart strikes up a conversation with a girl named Sophie. When she gets to the front of the line, she reveals to Krusty that she is his daughter.