Queen Greenmould and her court live directly under Buckingham Palace. They are all snobs and copy everything her Majesty does up above, including showering in the Royal Bathwater as it comes hurtling down. But the Queen is going slowly mad and pinches more and more things from the Palace. Suzie has to go down and help prevent her and the Slime-Grubbers stealing some far more important things than just all the Christmas fairy lights from the Palace above.