Henry was waiting for Jack in the rotunda when jack arrived back at GD. Grace was standing with him. She looked troubled, no doubt by what Jack had made her do nearly an hour ago, but he'd had to do it. Grace looked to Carter and then lowered her head.
Henry turned. "Jack what is going on."
"Walk with me." Jack said.
Henry bade Grace a quick goodbye and followed Jack toward the elevator.
"I need you to take a look at some things for me." Jack said.
"What?" Henry asked.
They entered the elevator. "Perkin's machine that Zane used. I need to know if he could've altered the setting of the machine or added anything to keep tow timeline from converging on each other."
"I don't see how that can tell me anything. If Zane managed to do what you're suggesting, our machine won't show any signs of alterations." Henry explained.
Jack sighed. "Damn."
"Jack what is going on?" Henry asked.
"If you knew that Grace was going to die, and you could use Perkin's machine to save her without any consequences, you would do it. Right?" Jack asked.
"Absolutely. In a heartbeat." Henry answered.
Jack nodded. He'd expected this answer from Henry. After all, Henry had already attempted time travel once to save Kim from dying. But Jack had to step in his way then.
"Jack?" Henry asked.
Jack sighed. "Jo's going to die tomorrow at GD."
Henry's eyes widened. "What?"
Jack nodded. "During the testing of Zane's project, something goes wrong. That's where Zane loses his leg. Jo goes back for him, but she dies in the process."
"Oh my god." Henry said. He looked from Jack.
"Zane says that because of her death, everyone suffers. He spends the next five years of his life in an institution trying to represses or cope with the accident." Jack explained.
"What's holding you back, Jack?" Henry asked.
"I can't let him do anything unless I'm sure the two timeline won't converge on each other like the last time. That's where I need your help, Henry. We've only got a few hours before Zane's test." Jack said.
Henry sighed. "Jack like I said, the machine won't show any signs. But if you had Zane's notes, I might be able to help you then."
Jack's head rose. He lifted Zane's backpack and unzipped it. He pulled out an old notebook and flipped it open. "How's this?"
Henry took the book from Jack. "This may be it."
"Henry we've got less than ten hours till Zane's test." Jack said.