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By Root 433 0

seemed to flash behind the circular lenses. “We call that the Poison Dome,” she explained. “For many years, Greenfields has been researching natural poisons . . . which is to say toxins such as ricin and botulin, which occur in nature and have the ability to kill human beings. Inside the Poison Dome, we grow some of the deadliest plants on the planet, including water hemlock, deadly nightshade, elephant’s ear, death cap mushrooms, and castor beans. The manzanilla tree has attractive fruit that you may choose to swallow. If you do so, it will kill you instantly. There is also a white resin dripping out of it that will blister your skin or blind you. The leaves of the ongaonga from New Zealand only need to touch you to produce hideous burns. It might interest you to know that a common nettle that you may find growing in your garden—Urtica dioica—injects you with five neurotransmitters when it stings you. The nettles inside the Poison Dome have been genetically modified so that they will sting you with five hundred neurotransmitters. I would like to imagine the pain of such a death, but in truth, I do not have enough imagination.”

She took out a tissue and touched it briefly against her lips.

“We are particularly interested in the way poisons interact,” she continued. “So you will also find animal life in there, including specimens of the blue dart frog, which releases lethal toxins from its skin, the banana spider, the taipan snake, and the marbled cone snail. A single drop of its slime can kill an elephant.” She paused and looked around the group. “If any of you would like to visit the Poison Dome, please let me know. Your visit will probably last about fifteen seconds before you die horribly.”

Nobody spoke. Miss Barry, the music teacher, had gone very pale.

“Very well. Let us head over to the first laboratory. I will ask your teacher to take a roll call when we enter and again when we leave.”

Tom Harris glanced at Alex, looking more doubtful by the minute. Alex shrugged. He was remembering what Blunt had told him about Philip Masters, how the whistle-blower had died. His body had been unrecognizable when it was found, and now Alex had a good idea what might have happened to him. Well, here was certainly one area of the Bio Center he’d be careful to avoid.

They went into one of the taller buildings with a steel chimney rising above them and smoke trickling into the sky. Beckett let them in using an electronic swipe card that she carried around her neck, and they passed into a clean, uncluttered passageway, where Mr. Gilbert took their names. As they set off once again, Alex made sure he was lingering near the back. They passed a restroom. Quickly he nudged Tom, who nodded back, and without hesitating Alex suddenly ducked sideways, throwing his weight against the door and plunging inside.

Suddenly he was alone, standing in a white-tiled room with two sinks and two mirrors in front of him. He waited until he could no longer hear the voices or the footsteps of his friends. Nobody had seen him leave. It was time to get started.

He took out the postcard with the view of Paris and went over to the sink. He ran a paper towel under the tap, then wiped it over the picture. The Eiffel Tower and its surroundings dissolved and disappeared. Underneath, there was an intricately drawn map of the Greenfields Bio Center, showing all the buildings and passageways, with two tiny lights already blinking. One was red. One was green. They told him where he was and where he had to get to.

He listened for a moment, and when he was sure that there was no one nearby, he slipped out into the corridor again, holding the postcard in front of him. According to the flashing display, the chief science officer—Leonard Straik—could be found in the building next door to this one, but the two of them were connected by a walkway, so Alex wouldn’t have to go back outside. All in all, he didn’t think he was in too much danger . . . at least not yet. He was wearing a school uniform, part of an invited group. If anyone did run into him, it would be easy