Spy Mice, book 3: Goldwhiskers
Heather Vogel Frederick2007

Oz Levinson is beyond excited when his family decides to spend winter vacation in England. The chance to tour London (aka James Bond's home base) and get a break from the school bullies will make this a very jolly holiday indeed. Even better, his friends D. B. and Glory Goldenleaf -- world-renowned spy mouse -- are along for the ride.
Soon though, their vacation turns into a business trip. A series of jewel thefts have left the police baffled, and Glory has her eye on some pocket-sized suspects. It looks like Goldwhiskers -- the richest rat in the world -- and some familiar rodent villains have their paw prints all over this. Then the rat thieves go after the big cheese: the Crown Jewels. In a race to return England's national treasures to safety, Glory Goldenleaf, international mouse of mystery, and her friend double-0 Oz are on the case!
--from the back cover.