At an airport waiting to return home, Drake recurves a garbled message; he's diverted to pick up a doctor, and bring him back to London. However, the man's very nervous as somebody tried to kill him. Drake realises there's something the doctor's he wants to keep hidden.
Returning to London, Drake receives a garbled message diverting him to the Middle East. He's to pick up a scientist, and accompany the man back to London. That's all Drake understood. When Drake meets the doctor, he's a very nervous man, who's hosting something,, and people want to kill him.—jem