The foot soldiers (engelsk)

In Denmark a Russian GRU agent Igor approaches an MI6 officer stationed in the country and says he wants to defect. This is a headache for MI6 as they are not benefiting from any intelligence he would have gathered for them as a double agent. Instead there is suspicion as to if he is a genuine defector or not. Meanwhile, Jonas Merrick is given the task to find out who is leaking information to the Russians.