Tony blinked looking up seeing no one even when he glanced around the room "What? Who's there?" he asked in the empty room as Jarvis asked "Is something wrong sir?" Tony figured he was hearing things if Jarvis didn't pick up on anyone in the building "No, I'm fine. I guess I got too involved with my book, you can turn on security mode and rest now Jarvis" telling his friend (Jarvis) that he can conserve his energy as there was nothing else he needed. "Yes sir" Jarvis switched to security mode leaving Tony alone in the tower and man was it quiet. Tony didn't know if he heard something in his head or if it was someone else.