Ghosts of Karnak — George Mann

A woman is found dead on the streets of New York, ancient Egyptian symbols carved into her flesh. A ghostly figure is seen floating over the rooftops of the city. And an expedition returns from Cairo to exhibit their finds at the Metropolitan Museum of Art. Gabriel's old friend and lover, Ginny Gray, was part of the expedition, but when Gabriel goes to meet the ship, Ginny is not on board. 

Ancient forces are stirring and the Ghost, Ginny and Gabriel's friend Donovan are caught right in the middle…