A leading terrorism analyst is found brutally murdered in Amsterdam. The Dutch police believe it is the work of a deranged extremist - but others know better. Gabriel Allon is called in to make discreet inquiries. It would seem that the dead man was close to uncovering the plans of a major terrorist operation. The trail leads to London, when a young woman vanishes . . . She is the daughter of the American ambassador - and god-daughter of the President of the United States - and the kidnappers' demands are at once horrifically clear and clearly impossible to meet. Allon engages in a desperate search for the missing woman - but the truth, when he finds it, is not what he expects.