After a plane crashes on arrival at a British airport leaving no survivors, the investigators discover that a component for an atomic bomb had been hidden inside some of the baggage. They suspect that individuals might be planning to plant a bomb under London and begin the search for a replacement piece that would probably be on its way.
The final episode in the series, and the second by writer Brian Clemens. Well written and tense throughout, this very dark story never really needs Brady (he is brought in because he is an expert on radiation) but is exciting enough that you never really notice. Deserving of a much longer run-time, the story builds to a good, if slightly rushed climax.
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