Mystery in Muscat

'How long is she in Oman for?' 'Ten days. And then they want to take her back home.' 'Ah, yes. But she's not going back to London. They're never going to see her again!' Jamie and Taymour overhear this strange conversation near their homes in Muscat. Two men want to kill an important visitor, it seems. But who is the woman in danger? And what can the boys do to save her? Can they, their sisters Sarah and Nadine, and their Australian friend Ruth find the answer to the mystery?