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?