Following the US execution of Bin Laden, Al-Qaeda vengefully activates a sleeper cell of suicide bombers, two of which detonate a nuclear bomb in the heart of London by ramming a vehicle into the Bank of England. In panic, people are forced to take shelter from the insidious radiation dust that settles like snow, waiting to be rescued. Soon the numbers of dead and mortally ill with radiation poisoning grow and grow. As the Americans flee the City within days, Britain's economy and tolerance goes into complete melt-down, the 2012 Olympics are cancelled due to non-attendance and military law is imposed to stop riots. Then reports confirm the attack is international in scale and members of the same cell are planning a follow-up attack in Britain. Will someone be able to stop them?