John Porter (Richard Armitage) led an SAS rescue mission in Iraq, on the eve of the invasion in 2003. During the operation, Porter spared the life of a thirteen-year-old suicide bomber. Shortly after, the boy apparently killed two of Porter’s team. Porter was held responsible by his commanders and forced to resign.

Seven years later, Porter is "reactivated" following the kidnap of journalist Katie Dartmouth (Orla Brady), daughter of a former government minister, by the same terrorists whom he had fought in 2003, including the same boy, As'ad. Porter succeeds in rescuing Dartmouth and joins Section 20, headed by Hugh Collinson (Andrew Lincoln), who had also taken part in the fateful mission. By the end of the series, it is revealed that Collinson was the one who killed the two soldiers, and covered this up. Section 20 officer Layla Thompson (Jodhi May) discovers his guilt, and blackmails Collinson into saving Porter's life in Afghanistan. There, Porter learns that during the mission, Collinson panicked and mistook the soldiers for terrorists. Taliban members raid their location, and Collinson is mortally wounded while aiding Porter's escape.

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