Hayes, Stephen. Magic Crystals. #bk. 4

Read by Nick Flint

A great war has enveloped the world, sweeping all before it and sending John and his friends, now wanted criminals, scurrying for cover. While those who can must take the frontline to protect as many innocent lives as possible, the Hammerson family and their army of loyal Hammerhearts swiftly take control of two thirds of the world, using magic to impact the minds of those previously in power to make them cave. John must struggle on two fronts as his social and romantic lives become ever more complicated, and he must be mindful of his safety every time he leaves the shelter of the Woodward Sorcerers' headquarters. Several of his friends would learn this lesson at enormous cost. The only chance our heroes have of survival is in the shape of a jittery old man, who may have all the answers; but in order to find out, the Chopville teens must undergo a journey of discovery and understanding first

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