A red flag went up in Pia’s brain. Although she was ravenously hungry, having missed a meal following her attenuated run, she couldn’t but help wonder about Paul’s motives. He was a man, a good-looking man, but she had had quite enough of men since she’d been a young girl in foster care. Perhaps more important than her need for food, she was really curious about the Chinese runner’s situation. She wanted to find out what Paul might be thinking as to his diagnosis. And she wasn’t excited about getting back to Nano quite so quickly and having to face Mariel. With such thoughts in mind, she decided to ignore the red flag, at least for the time being.

“What do you say?” Paul repeated. He could tell that Pia was miles away.

“Okay, sure,” Pia said. “Would they have something to eat as well as coffee?”

“Absolutely,” Paul stated. “But for food I’d recommend the cafeteria. A much bigger selection.” He motioned for Pia to follow, and together they went to the hospital cafeteria, still bustling with its lunchtime crowd.

Paul guided a tray past the food selections, and Pia absentmindedly placed a prewrapped egg salad sandwich and a bottle of water on it. She was not a finicky eater. She tried to pay, but Paul would have none of it, saying her money wasn’t good at his hospital. They took a table in the back of the room.

“So where do we start?” he said, taking a sip of his coffee. It was the only thing he had selected.

“What do you mean?” Pia asked, unwrapping her sandwich and opening the water bottle.

“I mean, that was pretty intense, right. You obviously know that woman who showed up. And what exactly is this Nano place? I don’t know anything about it.”

So Pia told Paul Caldwell about her work and about Nano. Paul had cycled on that same mountain route that she used for jogging, but he had no idea what went on inside the sprawling complex. As Pia talked, he began to think she didn’t, either.

“Your specialty is salmonella?”

“I did a lot of work on salmonella,” Pia said. “It’s what got me the invite to come out here to try to solve a problem that salmonella and other flagellated bacteria cause with a new way to fight sepsis through nanotechnology.” Pia stopped herself, remembering what Mariel had told her about secrecy. But Paul was an ER doctor—what interest could he have in nanotechnology, other than a professional curiosity?