My 7-year-old son began sleeping under his newborn sister’s crib—when I overheard what he whispered to her at 2 A.M., I went pale.

Enid Corrigan is sixty-seven and she came to help, and I want to be fair and say that she did help. She cooked. She did laundry. She got up with Ivo in the mornings so I could stay in  bed.

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She stayed in the small room at the back. It was meant to be a fortnight.

And two weeks after we brought Wynn home, Ivo stopped  sleeping in his room.

The first time I found him under her  crib I nearly laughed.

Seven years old, on the nursery floor at half six in the morning, with his pillow and his duvet, wedged in under the bars with one arm out.

I said, “Sweetheart. You’ve got a bed.”

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And he said, “I know. I want to sleep here.”

I thought: protective big brother. I thought it was the sweetest thing I had ever seen and I nearly took a photograph.

Then it happened the next night. And the next.

I carried him back to his own bed eleven times over eight days and every single morning he was under that crib.

Enid had a view about it.

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“You need to stop indulging this. He’s jealous and he’s using it, and if you let it go on he’ll be in that room until he’s twelve.”

She said it more than once. She said it in front of Ivo twice.

And I want to be honest that part of me agreed with her, because there is a bit of you that is always ready to believe the tidy explanation.

But something wouldn’t sit right.

Because of the other thing.

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Whenever Enid offered to take Wynn so I could shower or lie down — and she offered constantly, which at the time I read as kindness — Ivo appeared.

Not eventually. Immediately. He’d be in that  nursery inside of about thirty seconds, from wherever he’d been in the house.

I noticed it around the seventeenth of June and then, once I’d noticed it, I could not stop noticing it.

And on the twenty-second, Enid reached into the  crib to pick Wynn up and my seven-year-old stepped between her and the  cot.

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Physically. Put himself in the gap, facing his grandmother, with his back to his sister.

I said his name in a voice I am not proud of. I told him to apologise and he wouldn’t, and I sent him upstairs, and he went without a word and shut his door quietly, which is not what that child does.

Enid said, “You see.”

Thursday the twenty-sixth of June, at just after two in the morning, the monitor woke me up.

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Not crying. Whispering.

We keep the monitor on the audio setting because the camera one made me worse rather than better.

I lay there for about twenty seconds listening to my son’s voice and then I got up and went along the landing.

The nursery door was open a few inches.

He was under the crib. On his side, facing out, with one hand up gripping the bar above his head.

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And he said: “It’s all right, Wynn.”

I stopped in the doorway.

“I won’t fall asleep this time.”

Something went through me from my scalp down.

And then he said:

“I won’t let Grandma do it again.”

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I said, “Ivo?”

He jumped so hard he banged his head on the underside of the mattress base.

I got down on the floor next to him. It took me a moment because I was five and a half weeks postpartum.

I said, “Sweetheart. What does Grandma do?”

And my son’s face went, and he said:

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“I promised I wouldn’t tell.”

I said, “Tell me what?”

And he looked up through the bars at his sister, who was asleep, and he said:

“What Grandma does to Wynn when you and Dad aren’t looking.”

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I have never been that frightened. Not in labour, not at the twenty-week scan, not ever.

I said, “What did you see?”

And he put both hands over his face.

It took about eleven minutes and he cried through most of it and I did not interrupt him once, which is the only thing I did right that entire month.

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What he had seen was this.

Grandma put drops in Wynn’s bottle.

Out of a small bottle with a dropper in the lid, that she kept in her handbag, and later — after he’d seen her once — in the drawer of the little table in the back  bedroom.

He first saw it on the twelfth of June, in the kitchen, at about eleven in the morning, while I was asleep upstairs.

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He asked her what it was.

And she told him it was special  vitamins to make Wynn better, and that Mummy was very tired and got upset easily at the moment, and that it would upset Mummy to know about it, so it had to be their secret.

He is seven. He has been told to keep a secret from his mother by his grandmother, framed as protecting his mother.

He kept it for fourteen days.

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And in those fourteen days he did the only thing a seven-year-old can do with information like that, which is to physically place his body between his sister and the person he has been told not to talk about.

That’s the  crib. That’s all of it.

He slept under that crib because he had worked out that the times he could not see her were the times it happened, and the longest of those times was at night.

He said — and this is the sentence that I will hear for the rest of my life —

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“I fell asleep on Tuesday and when I woke up she was in the room.”

I woke Ewan at ten past two.

I put the light on and I said “get up,” and he sat up and looked at my face and did not ask a single question, which is one of about four reasons we are still married.

I did not go and speak to Enid.

I want to say why, because people ask.

Because I had a seven-year-old crying on a  nursery floor and a three-week-old in a  crib and one adult in the house I could not account for, and because whatever was in that dropper had been going into my daughter for a fortnight and I did not know what it was.

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I was not going to have a conversation. I was going to get facts.

Ewan went and stood on the landing outside the back  bedroom door. Not aggressively. He just stood there.

And I took the baby and my son downstairs and I rang the police at 2:40 in the morning.

I want to be plain about what I said, because I have been asked whether I over-reacted and my answer is no, and it is not close.

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I said: my son has told me that my mother-in-law has been putting an unknown substance into my three-week-old daughter’s bottles for two weeks without our knowledge, and my mother-in-law is upstairs in my house, and I don’t know what it is.

They were there in nineteen minutes.

Two officers. A woman called Ruvane who took the whole thing in the kitchen while the other one went up with Ewan.

Enid gave them the bottle out of the drawer without any argument at all.

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And then she gave them the box.

There was a box in the wardrobe in that back bedroom. Not hidden — in a bag, on the shelf, under a spare duvet.

Eleven bottles. Four of them opened.

Printed pages, stapled. A “protocol.” Dosing by weight, by age, in a table, from birth.