Following a suicide bombing in central London, series SAS hero Danny Black is recruited to be part of an assassination squad, directed by a joint MI5/MI6/CIA committee and tasked with hunting down and killing the terrorist cells believed to be planning further atrocities. Early leads take them to a North London mosque and a one-armed hate cleric, whom the Home Secretary repeatedly tries and fails to expel from the country, a sleazy Saudi prince living in a Park Lane Hotel - on the surface a devout Muslim, he devotes himself to booze, drugs and hookers as soon as his family are out of the building - and a grizzled ex-Regiment guy who is spreading rumours that Diana was assassinated by the SAS in the tunnel in Paris because of her Arab lover. The trail of clues takes Danny to a training camp in the Yemen, but just as he has the enemy in his sights, he discovers that they are somehow one step ahead of him, and he begins to suspect that they are being topped off by someone close to home.
