Sam Hunter returns to work one year after narrowly surviving an attempt on her life.
Sam thinks a man from her past may have something to do with the attempt on her life.
Turner hatches a diabolical plan with hedge fund manager Lewis Conroyn; Aidan uncovers some of Sam's secrets.
Sam awakes in the hospital and finds a familiar face who promises to be an ally.
Sam and Stephen grow closer; Sam continues her investigations into Hourglass.
Sam makes a startling revelation related to her past; Aidan tells Natalie to uncover the leak in M16.
Sam accompanies the Turners on a day out for Edward's birthday. Byzantium are standing by to kill Jack but have to abort when Edward is endangered.