Fletcher, Helen Vivienne, 1984- Reactive magic (Series) #bk. 4

Everything is about to end, but will it be in flames? For three months, Toby has tried desperately to free Callie. Meanwhile, she's just been trying to stay alive. As dangerous power escalates, the pair must figure out what bound them to the school. But breaking those bonds might mean taking drastic action, and survival is not guaranteed. Who will be left standing when the magic is destroyed? Explosive is the final instalment in the Reactive Magic series. If you like darkly magical tales, life or death drama, and a little bit of danger, you'll love this fast-paced series

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