How does an ordinary, young girl become transported back in time taking her miserable, teenage brother with her?

Arabella Twigg is studying history at school and her homework is to find out all she can about King George the Third. So she and Tom go to the local library, but as soon as they get inside, they find themselves in the King’s palace.

Arabella and Tom are presented to the King and Queen and meet some of the children. However, the King is doing odd things and people are wondering if he is mad?

Arabella and Tom get caught up in the strange happenings.