Cuckoo by Gretchen Felker-Martin

Invasion of the Bodysnatchers meets Tell Me I’m Worthless in this relentless and visceral horror about a group of queer kids trying to survive the conversion camp from hell, from the author of the critically-acclaimed Manhunt.
 
Something evil is buried deep in the desert.
 
It wants your body.
 
It wears your skin.
 
In the summer of 1995, seven queer kids abandoned by their parents at a remote conversion camp came face to face with it. They survived—but at Camp Resolution, everybody leaves a different person.
 
Sixteen years later, only the scarred and broken survivors of that terrible summer can put an end to the horror before it's too late.
The fate of the world depends on it.