One of the twin is cursed and doing evil.
One of the twin is desperately trying to save the other.
In the meantime, the magical characters from the Fairy world and the characters created by Conner united to fight against the evil witches.
Fun read. There is some sacrifice, and some characters destroyed. But it is not scary, so this is suitable for younger children.
The last book is fun and a good ending for the series, that centralised on the adventure of a pair of twin, Conner and Alex.
The self doubt is a curse. That life is unexpected but if everyone going to see from the basic human side of things, things are not as bad as it seems.