Nory, Bax, and their friends are in a special class at Dunwiddle Magic School, a class for children whose magic is unpredictable--and while Nory is finding an outlet for her dritten-self (a combination of a kitten and dragon), in the kittenball team, Bax is worried because all he can do is turn into a rock, and nobody knows why.

Dory and her friends from Ms. Starr's Upside-Down Magic class set off on an overnight school field trip to Dragon Haven to see, and learn how to care for, dragons--unfortunately there are other students with regular magic there as well, so it is not long before the trouble starts.

Marigold Ramos thinks that her magical ability to make things small will come in handy as she and her friends protest the new rule banning their toy dragons from school, until her magic gets out of control and starts shrinking her friends.

Tonight is the Big Night sleepover at Dunwiddle Magic School, when all the fifth graders stay overnight at school and participate in the scavenger hunt, except Nory's friend Elliott is attending a concert at rival Sage Academy where he plans to attend after the winter break--but if Nory can convince her fellow upside-down magic friends to take the hunt seriously, cooperate, and win, than maybe she can convince Elliott to stay at Dunwiddle.