The Game BBC2, 9pm
A string of shocking revelations means that Wendy’s undercover mission has become critical to the investigation, and she struggles to hold her nerve as the pressure rises. The team hopes she can keep it together as she tries to get close to her target, who proves to be a supremely tricky customer and harbours links to both the IRA and KGB. Meanwhile, Joe is facing troubles of his own, with the mission’s security under threat from a mole inside MI5 - can he discover the traitor’s identity before it’s too late? Starring Tom Hughes and Brian Cox.