Cairo, 1912. The Pasha receives an unexpected gift: a traditional Bride Box. When opened, however, the box contains an unwelcome jolt from the past . . . At the same time, a little girl is discovered riding under a train from Luxor - and the Mamur Zapt, Head of the Khedive's Secret Police, is called in to investigate. He soon finds himself confronting a political storm as the end of British rule approaches and his investigations uncover a tangled web of family loyalties and betrayals, with its roots in a slave trade long supposed to have been stamped out in Egypt.