Heart of light

On a luxury magic carpetship in 1889, an English couple travel to Cairo for their honeymoon. Except for a brush with a dragon, the voyage is uneventful. But for Nigel Oldhall and his beautiful Indian-born bride, Emily, the holiday hides another purpose. Within hours of arriving in the teeming city, they are plunged into an extraordinary struggle among demons, murderers, and magic to rescue a ruby that will ensure Queen Victoria's hold on Africa forever.--From publisher's description.