A Night in Terror Tower (1)

Sue and Eddie are taking a tour throughout London while their parents are on a business conference there. However, instead of going to an old boring museum, their tour group decides to visit Terror Tower, but once inside, Sue and Eddie soon get seperated from the tour group, and are chased by a tall, dark man wearing an executioner's outfit. After escaping the tower through the sewers, Sue and Eddie quickly return to the hotel at which their family is staying at. However, they can't remember their last name, and the room number that they give the man at the counter is vacant...