Commander's Eyes. Extra Elements Series, #28

Things at the Ranch are getting a little dark. George and Cassia, two of the RSO, Ranch Special Operations unit, are called out to help a base in need. What they find while there leaves everyone a little confused. Some of them are even acting strangely, and it isn't just the survivors the team finds and brings home to the safety of the Ranch. George is cold. Too cold. Ragel, the commander of the Nordic Combat Pilots almost losses a family member when George snaps and has to be locked up.
George and two other males, all of whom are no longer themselves. With his connection now possessed by a being of unknown power, Ragel can no longer keep himself away, stepping up for both George and Cassia, helping them and the rest of the Ranch battle the evil that has sunk its teeth deep into the life living out at the Ranch.