The BEST seasons of Spooks: Code 9

Every season of Spooks: Code 9 ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Spooks: Code 9!

London has been evacuated following a nuclear blast and the country's power base has shifted north. Thames House is gone and regional MI5 Field Offices have sprung up in its place. Are six young new recruits tough, moral and clever enough to protect Britain's future?