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Children's drama series about undercover agents in an inner-city high school. When freak power-cuts sweep the nation, the teenage spies are in the dark about who or what is to blame. A mysterious voice transmits a ransom demand - pay up or Britain will be sent back to the dark ages. Blane thinks there's some truth in Stewart's hair-brained theory that leylines are sucking away electricity. But Rose is unimpressed by Blane's hocus-pocus ideas.