Julie Kostas, Luke Mills, and Jason Betelli, aka the kid detectives, have one week of their holiday in London left. They decide to visit Baker St, the famous street where the fictional detective Sherlock Holmes lived. 221b Baker street, Holmes address, does not exist but visitors come from all over the world to walk on Baker street. There is however a Sherlock Holmes Museum. Enter the Museum and you will feel you have stepped into the pages of the Sherlock Holmes stories. Wouldn't you know it, the kids through no fault of their own, and by accident, find themselves in the middle of a modern day action mystery in Baker street. The previous week was taken up with the Missing Student adventure. Now before they have time to take a breathe, they are up to their ears in another dangerous escapade. Jason bought a red Sherlock Holmes deerstalker het et the Museum, but he can't wear it because the kid detectives must be as invisible as possible to succeed against the new gang of Crooks they have encountered. Two fast and furious adventures packed into two holiday weeks in London. They will need a holiday after their holiday when it is all over.