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January 1983, Blackwater Estuary. A new year brings a new danger to the Essex shoreline. An illicit shipment, bound for Colchester - 100 kilograms of powder that will accelerate tensions in the historic town, and leave its own murderous trace. DI Nicholas Lowry, and his team at Colchester CID must now develop a tolerance to one another, and show their own substance, to save Britain's oldest settlement from a new, unsettling enemy.