Spooks

Danny and Zoe are assigned to follow rogue scientist Eric Newland, an expert in plague bacteria, to a North Sea ferry, the Stena Britannica since 2011 renamed the Stena Scandinavica, with the hopes of dissuading him from selling biological weapons to North Korean buyers. However, Government Communications Headquarters (GCHQ) learn a deal has already been made, and the two are now ordered to kill Newland by overdosing him on insulin, as he is a diabetic. Zoe is unable to perform the task as she is suffering from seasickness, so Danny reluctantly carries it out with some persuasion and support from Adam. As this transpires, Ruth Evershed is interested in a man she was spying on, but could not bring herself to start a relationship with him. Later, Danny tells Zoe about Will's brother leaking the photographs. Feeling Will betrayed her trust, Zoe breaks off their engagement.