It was okay to be a little obsessive, Lucy Rossano told herself, trying to breathe. Perfectly normal. She clutched the shoulder bag that contained the book to her chest. It was the most valuable book she’d ever acquired in the eight years she’d been dealing in rare books. So of course she couldn’t bring herself to sell it, no matter the price, or donate it to a museum, or even lock it in the safe at the store. It was by frickin’ Leonardo da Vinci. Who wouldn’t want to carry it around all the time?

And sleep with it.

“I can’t believe you have a book that shows a picture of the very machine I’m working on.” Brad could hardly contain his excitement. He pushed past the guard’s desk at the Super Collider Lab. “Hey, Wally. Just in for a quick check on the power levels.”

The guard’s eyes widened. “Uh, okay, Dr. Steadman.” His stare shifted to Lucy. She could feel him registering the really red hair. It was the only reason anyone ever noticed her.

“Oh. Uh, Lucy’s my . . . my new research assistant. Lucy, why don’t you sign in?”

Lucy moved to the loose-leaf binder as if in a dream. This couldn’t be happening. Brad was wrong. Maybe the whole thing was wishful thinking on his part. Right. Wishful thinking—Brad? Practical, subatomic-particle-expert Brad? He’d been her father’s research assistant at Stanford. Wishful thinking wasn’t in Brad’s gene pool. She signed her name. The guard passed her a visitors’ tag. She clipped it to her black knit jacket. Her hand shook.

“You sure work all hours, Dr. Steadman,” Wally said, waving them through.

Brad grabbed her hand and practically dragged her through two double doors. When the doors were safely shut, he said, “And you showed it to me only hours after I’d had a breakthrough in powering the thing. What a coincidence!”