MI5 agent Beatrice Ogilvie is warned of an impending terrorist attack. Beatrice suspects that the Danish Secret Service agent Katrine Poulsen is involved and set a trap for her.
Beatrice is assigned to lead a security group for the Prime Minister, when he will meet a young woman. Has Beatrice been asked to enable an infidelity deal?
Evidence indicates that Russian money is financing a Scottish terrorist group. Meanwhile, Beatrice tracks down Oleg Adamov, the man who murdered her boss.
A bomb placed on a Danish bar by an agent led by Beatrice kills eleven civilians. At the same time as the yes votes for Scotland's independence increase, William asks Adam to resign.