Interpol have tried and failed to find her. Now the combined forces of Scotland Yard and MI5 must try the impossible to prevent a major international incident.

For Dominic Elder, Witch is his passion, his obsession. And being retired is no bar to his willingness to restart the hunt. MI5 know that the man who wrote the Witch file is the key to catching their quarry. But the truth isn't easy to spot. And it is only when an MI5 novice and his French counterpart piece together the smallest of clues, that Witch suddenly looks vulnerable.