The latest series of this hugely successful, long-running drama introduces a host of new characters who shake things up and give cause for concern as Section D, once again, are left wondering who can really be trusted. One month after Ros's funeral the team are tracking suspected terrorist, Abib, on a boat from Tangiers. When the boat is stormed by Somali pirates, a mysterious Eastern European 'prostitute' saves Lucas's life. This is Beth Bailey, who soon becomes a new recruit. Beth is an ex-mercenary: brilliant, strong and opinionated. She's definitely got the talent and strength, but is she mature enough? Over the series, Beth is challenged in particular when she goes undercover as an oil trader to protect an influential baron, and her murky past catches up with her. Dimitri, an ex officer in British Special Forces has been recruited for his skills in fighting terrorism on the front line. His approach to being a spy is much more relaxed than Lucas. He's funny and warm and likes to enjoy himself. Data analyst Tariq has been fast-tracked through the system. Young, bright and keen, he's a true computer whizz and what he lacks in experience, he makes up for with natural brilliance. Meanwhile the usually calm, confident Harry is caught in a difficult position when he is forced to work closely with the Russians. Relations between the CIA and MI5 reach breaking point over mysterious hackers. And a horrific truth about Lucas' past is uncovered by Harry when they come face to face in a compelling interrogation. Friendships are tested to the limit, Harry and Ruth's bond intensifies and the depth of deceit leads to the ultimate game of cat and mouse.