Papa Smurf leaves the Smurf Village to visit Homnibus, and Brainy Smurf decides to clean Papa Smurf's lab to surprise him, but then he finds a book with the pages blank save for the page number. Suddenly, as Brainy turns to the title page, the book says "hello", which scares Brainy Smurf. The book then says it can answer any question, so Brainy Smurf asks Papa Smurf's age, to test the book. The book tells Brainy Smurf to check page 36, which isn't blank anymore, and says Papa Smurf is 542 years old, which Brainy Smurf recognizes is right.