Mildred Hubble's world changes when a witch crashes into her balcony. She visits Cackle's Academy where she is amazed by everything - the magic, the potions, and that every student gets their own cat.

After she visits Cackle's Academy with her new witch friend Maud Spellbody, Mildred attempts to enrol by taking the magical exam.

Mildred learns that having a scaredy cat makes life at witching school tough - especially when Ethel Hallow is determined to see her fail.

Everyone's excited at the arrival of Enid, a young witch from the famous Nightshade family. Enid sees that Mildred is the local unwitting troublemaker and immediately latches onto her - it's the last thing Mildred needs.

As the end of year exams loom, Miss Cackle’s secret is still weighing heavy on Mildred’s mind.

Agatha takes over the school, and without Mildred there, who will save the day?