Lady Emily and her husband, Colin Hargreaves, have joined his formidable mother on a holiday to visit the exotic treasures of Egypt. Their host, Lord Bertram Deeley, is a renowned amateur British collector of antiquities, who has invited his closest friends on a lavish cruise up the Nile to his home at Luxor. But on the first night of their journey, he suddenly collapses after offering a welcome toast, a victim of the lethal poison cyanide. Who amongst...