A Lot or a Little?
What you will—and won't—find in this book.
Unlike Elloweer and Sambria, the kingdoms from Books 1 and 2, Zeropolis is very modern. Readers can think about how this world of intelligent robots, high-tech battle suits, speedy trains, and power crystals compares with ours. They also can think about how much work it is for an author to create all the aspects of a new world from his or her imagination.
Good vs. evil is the central struggle for the whole series, and extreme bravery is required. As in Book 2, the abilities of tweens/teens (and one small robot here) are underestimated by the enemy -- always a mistake. There's also ample warning about what can happen when you let your AI get too smart and how free communication is the enemy of any dictator.
Positive Role Models
Cole's a very thoughtful and deliberate character who chooses loyalty to his friends over personal safety. He's decided that he's more comfortable in this world of danger now but still maintains a determination to get back to his own world, even after everyone else has lost hope.
Violence & Scariness
There's a skirmish at the beginning outside modern Zeropolis where kids in animal form attack horses and people, and some guards die. After that, all the fighting is done in high-tech, nonlethal ways: nets that capture; foam and tar that harden over targets; some tranquilizer darts; and a drugging. When a monster rampages through the city, there's a mention that bodies are seen motionless on the sidewalk below. A bomb with no radiation detonates in an area outside where people live. Lots of talk of what might happen to Cole if he's caught spying -- he fears being tortured for information. A girl with half a prosthetic leg recalls the potential danger of pushing yourself too hard in battle suits that enhance physical abilities. Talk of a supercomputer that wiped out a whole city. Much talk of the loss of family in another world; when you cross over to the Outskirts, everyone you know forgets you ever existed.
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Parents Need to Know
Parents need to know that Crystal Keepers is the third book in the Five Kingdoms series from fantasy author Brandon Mull, who developed a big fan base from his Fablehaven and Beyonders series. If kids have already read some of Mull's books, they'll find this series less violent and just a little less complex than Beyonders. Unlike the first two books in the series, which include fantasy violence of the sword-and-arrow variety, only one skirmish at the beginning involves the killing of horses and guards that way. Then Cole and friends enter the modern city of Zeropolis and fight with high-tech, nonlethal weapons: nets that capture; foam and tar that harden over targets; and tranquilizer darts. Battle suits enhance physical abilities but can still harm the wearer -- a girl shows off her prosthetic leg as warning. Cole is always on the run from the bad guys and fears being caught and tortured for information. One robot causes a large explosion where people aren't hurt, and other takes out a few innocent bystanders.
Is It Any Good?
If you're three books into the series, you know what to expect from Brandon Mull: His fantastic and complex worlds, not the storytelling, are the stars of the show. He's prone to really taking his time to getting the reader to the climax of the story, weaving in too much detail. In CRYSTAL KEEPERS, for example, there are so many levels of bad guy -- High King, High Shaper, a supercomputer, Owandell, Nazeem -- that we're carried off in too many directions.
It's fun to see Mull go from his sword-and-sandal epics to full-tilt sci-fi. Zeropolis, with its crystal energy, sophisticated AI, and fun tar guns and battle suits will make readers long for Mull to keep the rest of the series high-tech. Cole seems to be having a lot of fun with his battle suit, and Sidekick the robot will be hard to leave behind when he heads off to another world in Book 4.
Did we miss something on diversity?
Research shows a connection between kids' healthy self-esteem and positive portrayals in media. That's why we've added a new "Diverse Representations" section to our reviews that will be rolling out on an ongoing basis. You can help us help kids by suggesting a diversity update.