Women are turning up dead in the rural outskirts of Virginia, killed in grotesque ways, and when the FBI is called in, they are stumped. A serial killer is out there, his frequency increasing, and they know there is only one agent good enough to crack this case: Special Agent Riley Paige.
While recording sound waves across the universe, NASA makes an astonishing discovery close to home. A strange audio transmission is detected in a remote region of northern Brazil. The transmission has no known source, and the signature has only been recorded on two other occasions: once from inside the Andromeda Galaxy.