Shazad Latif

As the fourth series of Spooks begins the stories are more relevant than ever before. The series has always been fast-paced and hard-hitting but now the battleground of national security provides an even more dramatic backdrop to the challenges facing the team from MI5. The group were left reeling after the shocking death of Danny at the hands of hostage-takers as the last series concluded. Now Adam, Harry, Ruth, Fiona and rising star Zafar set out to become even stronger in their battle to safeguard the nation. An action-packed series opener leaves MI5 with only 48 hours to prevent a catastrophe. And Adam faces one of the most difficult choices of his career in order to save a hospital from devastation: will he be forced to let a brave and innocent young woman die?

The team continues to contend with terrorist plots, embassy sieges, weapons proliferation and anarchists; not to mention the conflicts and power struggles back in the office. Can Zoe and Danny track Tom down and prove his innocence after he shot Harry? And is the latest addition to the team, former MI6 agent Adam Carter, a help or a hindrance?

This landmark series takes viewers into the thrilling world of MI-5 -- known to insiders simply as "Five" -- the clandestine security service, and the people who make up the elite team. They tackle organised crime, terrorist activities, embassy sieges, weapons proliferation and anarchists, not to mention the conflicts and power struggles back in the office.

Britain is left reeling after a series of terrorist attacks. The MI-5 team believe the attacks cloak a conspiracy to destroy democracy and turn Britain into a 'police state'. Can the team protect the democratic way of life? Zafar goes undercover and infiltrates a home-grown Islamic terror group who are planning a massive attack against London. There could also be serious repercussions for Ruth when she finds out the deaths of seven terrorist suspects in a prison fire were in fact staged by British military intelligence.