The summary is:
A girl named Luz and her friends are trying to stop the Emperor's plan to drain magic from the Boiling Isles. They encounter the Golden Guard, who is secretly the Emperor's nephew and has a mysterious power. Luz also asks Amity to be her girlfriend. Meanwhile, Eda's mother Gwen tries to cure Eda's curse with the help of a fake healer, but fails. Eda then asks her old friend Rain to help her protect her kids from the Emperor. Luz sneaks into the Emperor's mind and meets the Collector, a child from another world who controls the Titan. The Collector frees himself and attacks everyone, while Luz and her friends escape with the help of King's father.
Some possible facts extracted from the text are:
1. The portal door was found by Eda in the dirt and she used it to hide from someone.
2. Gwen is Eda's mother and she visits her every year with a new cure for her curse.
3. Master Warthop is a traveling curse expert and Gwen's pupil who gave her a dome with healing ability.
4. Luz and Amity confessed their feelings for each other and agreed to go out.
5. Hunter entered the Emperor's mind and found out about the Collector, a child from the stars who controls the draining spell.
6. Adrian Gray was an illusionist who tried to trick the Hexside students into getting sigils for the Emperor's Coven.
7. Rain was Eda's friend and the head witch of the Bard Coven who got captured by Bellows.
8. The Collector freed himself from Bellows' mind and wanted to play with Hunter.