When her brother Rolf dares her to catch Castle Glower magically creating a new room, Princess Celie takes up the challenge! No one knows the Castle better than she does. But, as usual, the Castle has ideas of its own. Can Celie keep up? Inside the room is hidden a giant egg, and it looks as if Castle Glower wants Celie to look after it! But what will she do if it hatches? Caring for it will prove to be especially tricky once Celie and her siblings realise what else the Castle is hiding . . . The egg-citing sequel to the charming adventure Tuesdays at the Castle.