The Defector

"Matt Reeves and his team, having successfully traveled back in time and taken Dr. Rossiter hostage, set out to assist him in creating the last trump card humanity has left against the Wraith; a deadly, alien-killing pathogen known as the Scourge. But Matt begins to suspect that mankind's future enemy may already be here in the present, lurking patiently in silence, waiting for the right moment to strike. Is the next Wraith invasion already here?" ― quoted from this book's product page on Amazon's website as of 2019-09-03.