Inside, there was only one person
He observed something that gave him hope when he peeked through the window again. Inside the lab, there looked to be only one person! Was that the Dr. Roberts referenced by the expert? Tommy didn’t care either way. He was only concerned about his book! And he was finally going to reclaim it.
He needed to get lucky
He devised a strategy: he would wait for the scientist to go out the door, and then slip into the lab just as it closed. Of course, for his plan to work, he needed a lot of luck. But Tommy couldn’t do anything else. He didn’t know the code, and he needed to sneak inside without being seen by that man.