The Mark of the Pasha by Michael Pearce

Gareth Cadwallader Owen is the Mamur Zapt, the Head of the Khedive's Secret Police. Unlike his British colleagues, Owen works for the Khedive. Owen, who has spent his career defusing political time bombs, learns from his agents, some Greek and Egyptian, that the streets have been made dangerous by threats of real bombs. The first order of business is to ward them off. The second is to insure the safety of an impending major European delegation to the capital.