“Exactly.”

Hannah stood in the doorway.

She watched her father turn the final card over.

It showed their house with a blue roof.

Arthur stared at it.

For several seconds, he seemed uncertain.

Leo waited.

Then the boy tapped the picture.

“Home, Gandad.”

Arthur looked at him.

Leo smiled.

“Home!”

The old man’s face softened.

“Yes,” he said.

He placed his hand over the picture.

“Home.”

Hannah stepped back into the hallway before either noticed her tears.

As the months passed, Leo developed a fascination with the black notebook.

He called it Grandad’s detective book.

Sometimes he asked Arthur to draw new pictures.

A cat.

A bus.

A biscuit.

Arthur’s drawings remained terrible.

Leo loved them.

One morning, Arthur drew a square with four wheels beneath it.

“What’s that?” he asked.

Leo studied it.

“Bus!”

“Excellent.”

Arthur added two windows.

Leo frowned.

“No.”

Arthur looked up.

“No?”

“Car.”

The old man laughed.

“You’re a harsh critic.”

Leo nodded seriously.

“Bad car.”

Arthur laughed so hard that Hannah came downstairs to see what had happened.

She found her father wiping his eyes and her son insisting that the drawing needed more wheels.

For several minutes, the kitchen sounded exactly as it had before the diagnosis.

Hannah stood beside the door, listening.

She had learned not to treat every good afternoon as proof that the disease had disappeared.

She had also learned not to let fear steal the good afternoons before they happened.

The second time Arthur forgot Leo’s name, the little boy was old enough to notice.

It happened the following summer.

They were sitting in the garden beneath a striped umbrella. Hannah was nearby, trimming a rosebush, while Arthur helped Leo fit large wooden pieces into a toy train.

Arthur looked at his grandson.

“Could you pass me that wheel, young man?”

Leo handed it over.

“Here, Gandad.”

“Thank you.”

Arthur attached it.

Then he asked, “What’s your name, then?”

Leo blinked.

Hannah turned.

Arthur looked confused.

The boy stared at him for a moment.

Then he stood.

He walked to the patio table, where the black notebook lay beside Arthur’s glasses.

He picked it up with both hands.

“Gandad book.”

Arthur watched.

Leo carried it back and placed it on the old man’s lap.

Then he pointed to the first page.

“Leo.”

Arthur looked at the writing.

LEO WHITFIELD.

MY GRANDSON.

Beneath it was the crooked bear.

He stared.

Something in his face shifted.

“Leo,” he repeated.

The boy nodded.

“Me!”

Arthur smiled.

“Yes. You.”

Leo climbed carefully onto the bench beside him.

“Grandad.”

Arthur put an arm around his shoulders.

For a while, they sat together without speaking.

Hannah remained beside the rosebush, the secateurs forgotten in her hand.

She had feared this moment for months.

Now that it had happened, she discovered it was both more painful and less terrible than she’d imagined.

Her father had forgotten a name.

Her son had shown it to him.

And life had continued.

That evening, Hannah found a note tucked into the back of the notebook.

It was written on a page Arthur had added several months earlier, during a period when he was still able to explain his fears clearly.

The handwriting was less steady than it had once been.

Some words had been crossed out.

But the message was unmistakable.

Hannah,

If you’re reading this because I’ve forgotten something important, please don’t be angry with yourself.

I know you worry. I know you think you ought to notice every little change before it happens. You can’t.

I made this book because I was frightened. At first, I thought I could keep everything by writing it down. Then Leo started playing with the pictures, and I realised the pages were doing something better than that.

They gave us a way to spend time together.

I don’t know how much I’ll remember in the years ahead. I don’t know whether I’ll always recognise the house or the park or even the people in it.

But please don’t let the disease become the only thing we talk about.

Keep the blue swings.

Keep the biscuits.

Keep laughing when Leo says my drawings are rubbish.

And if one day I can’t remember his name, tell him it isn’t because I stopped loving him.

Love, Dad.

Hannah read the note twice.

Then she sat on the kitchen floor and cried.

Not because the words surprised her.

Because they were so completely her father.

Even while frightened, he had been thinking about how to spare her pain.

On Leo’s fourth birthday, the family visited the park with the blue swings.

Arthur walked slowly beside Hannah, holding her arm when the path became uneven. His health and memory had changed, and he now needed more consistent support, but the park remained a familiar pleasure on good days.

Leo ran ahead with a small toy magnifying glass.

“Detective Leo!” he announced.

Hannah smiled.

“That’s right.”

The boy pointed toward the swings.

“First clue!”

Arthur looked up.

“First what?”

“Clue!”

Leo hurried toward the red postbox near the gate.

Hannah called him back before he reached the pavement.

“Stay with us, detective.”

He returned reluctantly.