The team has been left reeling by Lucas North’s betrayal, and with Harry Pearce on gardening leave, Section D has a new leader. Erin Watts is acting head and she has brought Calum Reed with her, a brilliant officer and technical genius. However, Harry Pearce survives his MI5 employment tribunal and is quickly back on the Grid in the thick of the action.

Episode 1 airs at 9pm on Sunday 18th September on BBC One.

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In this clip, Harry suspects foul play when he visits the apartment of former Cold War cut-out Max Witt, who has been found dead…