Salim Dhar is the world's most-wanted terrorist and has disappeared after an attack on an American target in the UK.
The CIA suspects the involvement of renegade M16 officer Daniel Marchant, leaving the relationship between London and Washington in tatters. But marchant has a larger secret: he is enlisted Dhar to assist M16 and protect British interests.
In exchange for information, Dhar needs Marchant's help to plot one finalb strike against the US. It will compromise Marchant's love for CIA agent Lakshmi Meena and may threaten to send him into the cold good.