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Detective Murdoch and his colleagues face an entirely new dilemma when they find a local industrialist, Richard Welch, tied down at the top of a telephone pole with a noise-activated bomb strapped to his chest. Mayor Clarkson orders all industries in the area shut down and the police do their best to keep the noise pollution to a minimum. Under pressure, the mayor eventually relents and work resumes leading to the bomb going off. The next victim turns out to be the mayor himself and Murdoch has only 3 hours to find the culprit and deactivate the device. Meanwhile, Julia is increasingly frustrated as Murdoch has yet to ask to ask her the big question.