Prisoners of the Dulce Base by Sherry Shriner
@ 11:09 - 11:16 - “Many have been soul-scalped and replaced by aliens themselves who now inhabit their bodies permanently”.
@ 13:20, 13:59, 16:49 & 28:23 - mentions cloning, clones and other interesting stuff.
@ 19:30 - 20:09 - “In their insane desire to have human bodies as their own, Aliens have perfected the ability to take a person's soul out of their body and put it 'elsewhere.' This gives them access to a human body devoid of a soul. The body is a shell, a carcass, and they can take over and possess this body and use it for themselves. This is termed as "walking-in." There are two types of walk-ins. Aliens can walk-in and possess a live human body, and/or a dead human, or in this instance, a live human who had their soul removed and then their body was taken over and walked-in by an alien”.