Beatrice has a secret-many secrets, actually, and she keeps them all to herself, apart from sharing a few with her best friend Mark. Every Sunday, Beatrice embarks on a crazy adventure with her other bestie, who happens to be the talking London Bus RM 168 via Waterloo. London is not the city everyone thinks it is. The Bus shows her a ghostlike city no one knows still exists, a city full of secrets, illusions, and traps. Its inhabitants-famous talking buildings, parks, and tourist attractions-all have hopes, unfulfilled dreams, and problems, just like her. She's captured by the sloppy MI6's spies, helps a whimpering Red Telephone Box resolve the mysterious disappearance of her phone, and then meets the Mayor of London, who has two big secrets of his own. And he's planning to get rid of the old London Bus.