It is the winter of 2001. A terror ship is bound for Britain carrying a horrifying weapon. The British military sends a crack unit of SAS and SBS to assault the vessel before she reaches London. So begins a true story of explosive action as this band of elite warriors pursues the merchants of death from the high seas to the harsh wildlands of Afghanistan. The hunt culminates in the single greatest battle of the Afghan war, the brutal and bloody siege of an ancient mud-walled fortress crammed full of hundreds of Al Qaeda and Taliban.