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Here’s a dossier summarizing this season’s notable espionage series and the stars who drive them.

The London office where much of “The Agency” takes place captures the contradictions of this contemporary espionage drama.

Beijing has always denied all accusations of espionage.

His research often embarrassed the authorities, who were forced to admit that some of the shady tactics he revealed were used in real-life espionage.

Ken McCallum, MI5 director general, meanwhile, has previously warned of a sustained campaign on an "epic scale" of Chinese espionage abroad.