Kudzu

Dr. JJ Bookman is an exobiologist, on his way to Tallahassee to plan future research, but everything is down. No electricity or cell service. He finds a hotel that takes cash, and he waits for the gas stations to get power. He sees the Humvee enter the hotel lot and stop behind a car. The Sergeant, in full battle gear and grenades, checks the first tag. With a shake of his head, the Private pulls to the next car, the next, and then JJ's. JJ rolls up his window. The Marine Sergeant checks JJ's tag and looks at his clipboard again.
The Marines exit their vehicle, rifles ready, and the Sergeant nearly breaks JJ's window with the butt of his rifle. "Get out!'JJ didn't move fast enough, and the Marine hit the glass again. JJ opens the door, they drag him out, zip-tie his hands, and throw him into the Humvee. They take him to a secret facility in one of Florida's many limestone caverns because something found the secret base and knocked on the door.
And no, JJ does not speak 'alien.'