Raven's Gate, by Anthony Horowitz

After he is caught stealing, Matt seems to be let off easy: he is sent to a farm to do work for a certain Mrs. Deverill. But when she turns out to be as sinister as her name suggests, Matt tries to escape and finds that all roads just lead back to her place in the town of Lesser of Malling. Turns out that the residents are trying to awaken an ancient evil and they have a deadly role for him to play...

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