It's a baptism by fire when new recruits Jamie Dow and Alex Leonard join the SAS's elite fighting force team. Hot on the heels of an explosive hostage-rescue exercise in the regiment's Killing House, Red Troop led by charismatic Sergeant Henno Garvie is called to take command of a bank siege. This time the life or death situation is dramatically and tragically real.

As Red Troop bury Sam Leonard, a gunman shoots at a prominent European banker using an awesomely powerful sniper's rifle. He misses and the SAS are scrambled to find the gun and the British anti-globalist group suspected of carrying out the shooting. Jamie infiltrates the eco-warriors, convincing them of his skills as a sniper. But when things go wrong, it's not just a banker's life that is threatened.

Red Troop is called to a pharmaceutical laboratory after three Chechens break in to an area where scientists are working on a vaccine for a deadly form of anthrax. The gang threaten to release the anthrax, killing thousands, unless they are given money. Caroline gains access by posing as a doctor but Henno is captured and shot. Is blowing up the building and everyone inside it the only solution?