Welcome to the British Museum, home to Lottie Lipton: nine-year-old investigator extraordinaire! Lottie loves the Great Library and all the beautiful books that fill it. But the money hungry Head Curator of the British Museum, Sir Trevelyan Taylor wants to sell all of the ancient books to the highest bider. The missing scroll of Alexandria is the only thing that can prove that the books must stay in the museum. Can Lottie, Great Uncle Bert and Reg the caretaker follow the clues and track down the missing scroll before it's too late?