Code orange

Mitty, thinking he was infected with smallpox, was convinced too follow a strange lady into her car with the promise of help with his suspected smallpox. What he didn't know was that the lady he thought was gonna save him was that she was actually a terrorist planing to use his smallpox to kill of everyone he loved. 

He later wakes up in an abandoned warehouse taped to a chair unable to move while his kidnapers examine him. He later gets left alone in the room and is left to die from smallpox so that the terrorists may use his infected body against society. 

The FBI also tries to contact him, and starts a search after they hear about his disappearance. While his friends only think he's skipping school, the FBI suspects he might have been taking against his will.