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During a handover to the head of counter-terrorism of MI5, Harry Pearce, a terrorist escapes custody. When Harry disappears soon after, his protégé is tasked with finding out what happened as an impending attack on London looms, and eventually uncovers a deadly conspiracy.
Spooks: The Greater Good - watch online: streaming, buy or rent
You can buy "MI5" on Apple iTunes as download or rent it on Apple iTunes online.