New York Times Bestseller

Dr. Jonathan Ransom, a surgeon for Doctors Without Borders, is climbing in the Swiss Alps with his wife, Emma, when she falls into a hidden crevasse and dies. Twenty-four hours later, Jonathan receives an envelope addressed to his wife containing two baggage-claim tickets. Puzzled, he journeys to a railway station only to find himself inexplicably attacked by the Swiss police. Suddenly

A terrorist is targeting Britain. And to make matters worse it’s an “invisible”— Mi5-speak for someone traveling under a British passport. Virtually impossible to find before it’s too late.

The job falls to Liz Carlyle, the most resourceful counter terror agent in British intelligence. Tracking down this invisible is a challenge like none she has faced before. It will require all her hard-won experience, to say nothing