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A young person dies of cancer in a small town, the parents believe it has something to do with an electricity pylon being built next to their house. It is later found out that the child had been playing/exploring in a tunnel where a military train had crashed and burned, releasing a dangerous nuclear payload into the surrounding area, this was the source of the child's illness. I also remember some part about an area closed off by the British Army for training purposes, but it was actually them attempting to hide the accident.