Sir Stafford Nye's journey home from Malaya to London takes an unexpected twist in the passenger lounge at Frankfurt -- a young woman confides in him that someone is trying to kill her. Yet their paths are to cross again and again -- and each time the mystery woman is introduced as a different person. Equally at home in any guise in any society she draws Sir Stafford into a game of political intrigue more dangerous than he could possibly imagine. In an arena where no-one can be sure of anyone, Nye must do battle with a well-armed, well-financed, well-trained -- and invisible -- enemy...

This is one of AG's none series novels. The story begins well but if you can sort out the muddle, please let me know; you would be the first. It is one of the later books AG wrote. I didn't know it by listening; it seemed to me to be one of her earlier books altogether.