From audible.com:

When linguist Andrew Dennison is yanked from his bed by the Secret Service and taken to a top secret facility in the desert, he has no idea he's been brought there to translate the words of an ancient demon.

He joins pretty but cold veterinarian Sun Jones, eccentric molecular biologist Dr. Frank Belgium, and a hodge-podge of religious, military, and science personnel to try and figure out if the creature is, indeed, Satan.

But things quickly go bad, and very soon Andy isn't just fighting for his life, but the lives of everyone on earth…