The Ghosts of Epidoris. Cap Kennedy Book 14

THE DAUGHTER OF KAIFENGThe world was haunted. Every sunset the natives went home, locked their doors, and pulled down the window blinds. Ghosts didn't scare Kennedy. As an agent of FATE, it took more than superstition to shake him. But Epidoris was the real thing. Monsters did appear in the darkness, people did vanish at night - a whole MALACA barracks had vanished, garrison, weapons and building.
That's what brought Kennedy to Epidoris. That and one thing more - a creature of the infamous Dr. Kaifeng had turned up. A beautiful woman, a princess she called herself - but Kennedy had seen her before - lying in a processing vat on a Kaifeng planetoid of warped genetics. Between the scientific machinations of the galaxy's most perverted mind and the spectral realities of a disputed world there had to be a meaning that boded no good for Terra - and that's where Kennedy came in.