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A great number of senior civil servants, members of parliament and intelligence personnel are dying suddenly, apparently of natural causes, and no link between all the deaths can be found. Then a dying British agent talks about 'angels of death' that kill from within.

Mannering and Cordelia, held captive on a blacklisted freighter, learn that the ship's crew form part of a plot designed to disturb an American space capsule from its orbit.

A retired judge enlists a self-made man from Brooklyn and a British aristocrat to fight crime.

After finding his asteroids tracking satellite was being secretly used for military surveillance, Steve Thomas blew the whistle, costing his career, family and friends. When he discovers a threat to the entire world, Steve must become a fugitive from the law while trying to...

In this episode, the helicopter team face a difficult decision after one of their own calls for help.