23 - Corpus Earthling by Louis Charbonneau

In a not-so-distant future, Paul Cameron, an English literature teacher, leads a seemingly content yet lonely existence in his trailer perched on Mulholland Drive, overlooking the sprawling city of Los Angeles. As humanity gears up for an ambitious terraforming mission to Mars, Paul grapples with a troubling secret he hears voices. These are not mere figments of his imagination, but telepathic communications from alien beings who have taken over human bodies, plotting an impending invasion. Can Paul unravel the mystery of these hidden invaders and thwart their plans before its too late for mankind? - Summary by Ben Tucker