Jon Courtenay Grimwood

pashazade
With its face to the sea and its back to the desert, El Iskandryia is North Africa's most urbane city. A metropolis where cultures meet and clash, where money can buy you everything but safety.
On the run from a Seattle prison, Ashraf Bey finds himself main suspect in an Iskandryian murder, hated by the woman he was supposed to marry and responsible for the welfare of his nine-year-old cousin . . . all in a world where Germany won the First World War. In a Middle East where the Ottoman empire still dominates . . .

effendi
Ashraf Bey is a fugitive from the US justice system, definitely; son the of Emir of Tunis, possibly; and Chief of Detectives in the El Iskandryian police force, apparently . . . Small wonder he's a little confused.
Raf's ex-fiancee Zara doesn't want to see him. His nine-year old niece is busy doing things with computers that are strictly illegal. And when the city starts to fall apart, Zara's father is accused of mass murder and Raf begins to learn the true cost of loyalty . . .

felaheen
Detective. Diplomat. Uncle. Killer . . . Ashraf Bey has been many things since arriving in El Iskandryia but not, as yet, a son to Moncef, Emir of Tunis.
And now it may be too late; Moncef is either already asassinated, or hovering on the edge of death. And despite refusing Emir's chief of security's plea for help, Raf still finds himself being drawn towards Tunis . . .