Bart sneaks into Lisa's room to steal her propaganda and he finds her diary. Just before Lisa comes into the room, Bart escapes with the diary. Bart plans to make some changes to the diary and send it to "Springfield Publishing Contest", whos editor-in-chief is Seymour Skinner. After Skinner reads the diary he comes to Lisa and she finds out that Bart sent it in to the contest. Skinner wants to offer her a publishing contract.
The book becomes a success, but Lisa is worried that she did not have time to read the book before it went to the printers. Marge decides to read the book and is not happy about what Lisa wrote. Lisa explained that someone had modified the text and Bart acknowledges that he did it. Marge wants to stop the printing but when she gets the first check of $45,000 she quickly changes her mind. Lisa gets a new style and become popular, but after a while, Lisa is not on the best seller list and she returns to her normal self. The family sits down and watches TV where they discover that Bart was paid to get the viewers to believe that he knew the truth about one of Mayor Quimby's illicit relationships and revealed that he is only a ten year old boy pulling a prank. Quimby calls Bart and thank him for what he did. The next day Lisa inaugurates a bookstore where Troy McClure comes and says he wrote the book and Lisa plagiarized it.
There was a trial over who owns the rights to the book, in which Bart helps Lisa after she runs into legal difficulties. Bart does admit to the book's misquotes and the judge wants to put Bart away but he manages to get out of it by saying that Edna Krabappel, Chief Wiggum and Otto fabricated stuff in THEIR books and go off scot-free. The judge agrees to let Lisa off the hook as long as she and the other three donate their proceeds to charity.
Three months later, there is a queue outside the book store and it turns out that Bart has written a book about how he won the case and reveals to be the "soon to be author of growing up Simpson: the recessive Simpson gene" which makes Homer irritated, prompting him to chase Bart, but instead Bart mentioned that he blamed it on Grampa.