ISBN-13: 9780635034694 / Angielski / Miękka / 2005 / 129 str.
Grant spots a big problem with Big Ben-- and he and his sister, along with their two new best friends, George and Maggie, take a whirlwind tour from the top of the Eye, up the Thames River, down into a dungeon, and more-- in search of clues to solve The Mystery of Big Ben.