Slave Planet Earth

Humans, including nuns, disappear from the face of earth. Pigs and cattle disappear. Japanese fishermen report that a disk like craft lifts tons of tuna from the ocean.
Who would be doing it and what is their reason?
The Persire Julius Hersey and FBI Agent Lena McCabe travel the world and in outer space to find out who might be responsible for the disappearance of human beings and livestock. The investigators were stunned to find out that an alien, reptilian race invade earth and use living entities from earth as their sex objects as well as their food supply. And why shouldn't they? After all, earthlings use cattle, pigs, chickens, sheep, deer, rabbits and fish for their food supply. And, on rare occasions they still engage in cannibalism.
Is that a fair condition?
To the reptilian it is. To the humans it is not. Because humans and Persires look similarly, they form a partnership. Conflicts arise. A war breaks out between the Persires and their archenemies, the reptilians. Persires die. Humans die. Reptilians die.
The Lord Mayor of the Persires builds a roboid factory. Because of a malfunctioning air-conditioning system, the roboid, Phebious, assumes human characteristics and starts his own movement more dangerous than the Ducazians could ever dream of .