The Key of Mystery is an interesting book, if you can make it past the first half. The pacing of the first half of the story was extremely slow. I was tempted to not finish the story, but midway through it picked up. It picked up so much, it felt a bit rushed, but that is fine considering the first half of the story.
The plot was interesting, but I couldn’t connect to the characters. Sera was a bit whiny at times. Peter could have been fleshed out a bit more. I didn’t see any romance between them.
The story overall was okay but if you can power through the first half, you may enjoy it.