This is one of Christie's spy thrillers, inspired by her time in Baghdad with her archaeologist husband.
It begins with a secret summit of superpowers - set to meet in Baghdad. Only a powerful organisation - opposed to capitalism and communsim - is out to sabotage the talks. Enter Henry Carmichael, a spy who has information that could out the ring of saboteurs. Unfortunately, he dies in Victoria Jones' hotel room before he can tell anyone more than 'Lucifer Basrah Lefarge'. The first time I read this book I felt really depressed by Carmichael's death - he'd fought so hard to survive, chased across the Middle east, then dies in Baghdad just when he reaches safety. It just felt too cruel - and still does.
Victoria is only in Baghdad on a whim, wanting more adventure than her life had brought so far. After being filled in on the situation by Mr. Dakin (there's always a spider manipulating the spy web), Victoria leaps into the fray, carries on Carmichael's work, helps solve the mystery and meets her future husband archaeologist Richard Baker.
It's an enjoyable thriller. I've read it twice now and I know I'll read it again and again. It's just one of those annual books. No matter how many new books come out, there's only so many books that call to you and want to be kept on your shelf forever and always to be read at least once a year. For me, this is one of them.