Things are quiet in New York. Unusually quiet. Gabriel – the Ghost – knows that something’s wrong. There’s a heat wave building for a start, and it feels as if the pressure’s getting unbearable. Something’s going to give.

When an expedition returns from Cairo to exhibit their finds at the Metropolitan Museum of Art, Gabriel takes a keen interest. His old friend and lover Ginny Gray, who he hasn’t seen for over a year, was part of the expedition. But when Gabriel goes to meet the ship, Ginny is not on board.

Something happened to Ginny in Cairo, out on the dig. Something that’s related to a strange cult known as The Circle of Thoth, a baboon with a clockwork eye, dust devils on Fifth Avenue, robed assassins, sacrificial rites, a ‘resurrection machine’ and a ghostly figure clad in trailing bandages, seen floating over the rooftops of the city.

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