Tobias Rothman was happiest when he could work uninterrupted in the safe confines of the lab, with Dr. Yamamoto at his side. Yamamoto was like Rothman’s right arm. He could hold out a hand, and Yamamoto would know what he wanted without him having to ask for it. The two men communicated by looks and pointed fingers and sometimes, Rothman swore, by intuition. If Rothman could intuit anything as they worked together under the hood in the biosafety level-3 lab today, it was that his colleague didn’t feel so good because a couple of times he’d uncharacteristically missed Rothman’s cues. In truth, Rothman hadn’t been feeling particularly well himself for the last hour or so. He had some mild gastric distress but worse was a kind of light-headedness, as if he were walking on eggshells. It had started about an hour after their coffee break at nine. They’d been in the unit since six.

Rothman looked over at Yamamoto. He was facing the wall, resting his hands on the lab bench, breathing hard. Yamamoto turned to look at Rothman, and Rothman could see that he was shivering. With a hood and mask, all Rothman could see of Yamamoto’s face were his eyes, which reflected fear. Suddenly Rothman felt it too, and began to shiver himself. It was as if he’d just jumped into a bath of ice water, yet he was sweating, and he felt nauseous. It was impossible that what flashed through his mind could be happening—they’d taken all their usual precautions, and their safety record was perfect.

The next moment Yamamoto’s eyes rolled up in his head, and he collapsed limply onto the floor. Rothman tried to steady himself before going to Yamamoto’s aid, but he felt suddenly much worse. The room swam before him. He knew he was going to black out and just before he did, his hand reached for the red button on the wall.

Pia was sitting in her office comparing notes with Will and Lesley. It was crowded but quiet. They’d taken refuge in there despite its diminutive size as there was yet another workman in the lab proper, again working up in the ceiling with all the electrical wires. He’d briefly been in her office as well as Rothman’s but thankfully had left both. Luckily it wasn’t the same guy, Vance, who’d been such a pain weeks earlier.

The three students had formed an effective unit in their three weeks together and were making good progress with the temperature and pH issues with the organ baths. They’d spent almost all of their waking hours including weekends in the lab, but none of them begrudged a minute of it.

Then, in an instant, it was as if a riot had broken out at the door to the lab.

“What the hell?” Will said, as the three students piled out of Pia’s office.