Spark is the second book in the Sky Chasers series. The last book ended with the kids on the ship alone and their parents being held hostage on the other ship. This book takes off where the last book ended with Kieran having a major power trip and refusing to listen to reason while Waverly and Seth tries to save the ship which is in major trouble due to Kieran's refusal to listen to anyone.
I found myself speeding through this book, there was just so much going on. The characters however were a little too black and white. I found myself getting so upset at Kieran who seemed so stupid that you could hit him in the head with something and he'd refuse to acknowledge that anything was there while Waverly was always right and always had the right answer. There were several great twists and turns with the mystery and the ship and the politics between the two ships kept me interested.
Appropriateness: There was no adult content in this book although it was very violent. I would recommend this book to readers 13+
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