She entered the secured room.
I followed.
The door locked behind us. The air was cold, and everything inside was where it should have been.
My mother walked to the secured storage. I stayed a few feet behind her. She checked the container, then the seal, then the indicator, slowly, the way she used to check on me when I was asleep, as if she needed to confirm that something was still there.
"This is the only batch," she said.
"I know."
"If it leaves this room, we cannot promise what happens."
"I know. I'm listening. I'm—"
"You're waiting for me to finish so you can tell me about the antidote."
I did not answer. She was right.
"If there is nothing to sell," she said, "there is nothing to decide."
"Then we lock it up. We keep it here and we—"
"And in a year, when the money is gone and someone else is at the door?" She shook her head. "In five years? I won't always be here to say no, Daniel. You'll be standing in this room by yourself."
"Mom."
"And if I destroy it, you'll make more. You are good enough to. You would do it the week after I'm gone, and you'd tell yourself it was for the work."
"I wouldn't."
"You would." She said it without anger. "So I'm going to make sure you never want to."
I saw it in her face then. It was not fear. It was a decision, and it was calm, which frightened me more.
"No." I stepped toward the container. She stepped into my way.
"Get out."
"I'm not leaving."
"Please."
I had never heard her say that to me, not like that. I stopped.
For a moment she was not the famous scientist. She was the woman in the kitchen with the blue mug, the woman who had sat beside my bed when I had a fever, the woman who had told a frightened child that doctors were there to make fear smaller.
She turned back to the container, and I understood what she intended.
I moved.
"Mom!"
I was close enough to touch her. I got a hand on her sleeve, then her shoulder. But her hands had spent a lifetime being steady over things that mattered, and mine had not. She slipped free of me without hurry, the way she used to take a pen out of my fingers when I was small.
She broke the seal and lifted the lid. She did not turn her face away. She stood over it and let it reach her, and I knew from the way her shoulders settled that she had done exactly what she meant to do.
The sound was small, almost nothing, the sound of something designed never to open, opening.
I stopped. For one second neither of us breathed.
She did not look at the container or at her hands. She looked at me. I have gone over that look more times than I can count. There was no regret in it. What I saw was worry that I would still try to reach her.
"Don't," she said. "Don't come closer."
Then she did what she had done her whole life when something went wrong. She took care of the room. She started the sterilization cycle for what was left in the container, and the indicator turned from amber to green. She checked it twice. Then she keyed the door.
Nothing left in that container could be sold now, or stored, or carried out by anyone else. Whatever was left of it was in her.
"Go."
I could not move.
"Go, Daniel."
"Mom, please."
"I told you there would be a number." Her voice was very quiet. "I'm not going to live long enough to hear it."
She was already stepping back. She looked frightened now, and pale. But she was smiling, the same small smile she used when I was a child and had done something stupid, the one she gave me when I burned the toast and the one she gave me when I told her I wanted to be a doctor.
"You were always stubborn," she said.
I could not speak.
"You wanted to save the world. Start by not destroying it."
The alarm began to sound. She crossed the room and pushed me, with both hands, toward the door. I stumbled through it. She stayed inside.
The door shut between us.
Through the observation window I watched my mother put her left hand against the containment panel and look at me as if she were trying to memorize my face. Behind her the clock went on moving, which still seems to me a kind of insult.
I put my hand against the glass.
She smiled.