MI6 receive word that radioactive material has been detected at an airport.
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Episode 3 - MI6 receive word that radioactive material has been detected at an airport.
Ghosts from the past come back to haunt MI5 chief Harry Pearce.
High-level secrets are stolen when Calum is mugged outside Thames House.
Two former inmates are released from jail and set to launch an attack in London.
Harry kidnaps his CIA counterpart, and what he learns sheds fresh light on events.
Harry is handed over to the CIA, ready for deportation to the US.