I turned away, pretending to peer into a shop window, unsure if I wanted him to know that I had seen them, and tried very hard not to think about it again.

On the Friday after my dad lost his job, Will received an invitation – a wedding invitation from Alicia and Rupert. Well, strictly speaking, the invitation came from Colonel and Mrs Timothy Dewar, Alicia’s parents, inviting Will to celebrate their daughter’s marriage to Rupert Freshwell. It arrived in a heavy parchment envelope with a schedule of celebrations, and a fat, folded list of things that people could buy them from stores I had never even heard of.

‘She’s got some nerve,’ I observed, studying the gilt lettering, the gold-edged piece of thick card. ‘Want me to throw it?’

‘Whatever you want.’ Will’s whole body was a study in determined indifference.

I stared at the list. ‘What the hell is a couscoussier anyway?’

Perhaps it was something to do with the speed with which he turned away and began busying himself with his computer keyboard. Perhaps it was his tone of voice. But for some reason I didn’t throw it away. I put it carefully into his folder in the kitchen.

Will gave me another book of short stories, one that he’d ordered from Amazon, and a copy of The Red Queen. I knew it wasn’t going to be my sort of book at all. ‘It hasn’t even got a story,’ I said, after studying the back cover.

‘So?’ Will replied. ‘Challenge yourself a bit.’

I tried – not because I really had an appetite for genetics – but because I couldn’t bear the thought that Will would go on and on at me if I didn’t. He was like that now. He was actually a bit of a bully. And, really annoyingly, he would quiz me on how much I had read of something, just to make sure I really had.

‘You’re not my teacher,’ I would grumble.

‘Thank God,’ he would reply, with feeling.

This book – which was actually surprisingly readable – was all about a kind of battle for survival. It claimed that women didn’t pick men because they loved them at all. It said that the female of the species would always go for the strongest male, in order to give her offspring the best chance. She couldn’t help herself. It was just the way nature was.

I didn’t agree with this. And I didn’t like the argument. There was an uncomfortable undercurrent to what he was trying to persuade me of. Will was physically weak, damaged, in this author’s eyes. That made him a biological irrelevance. It would have made his life worthless.

He had been going on and on about this for the best part of an afternoon when I butted in. ‘There’s one thing this Matt Ridley bloke hasn’t factored in,’ I said.

Will looked up from his computer screen. ‘Oh yes?’

‘What if the genetically superior male is actually a bit of a dickhead?’

On the third Saturday of May, Treena and Thomas came home. My mother was out of the door and up the garden path before they had made it halfway down the street. Thomas, she swore, clutching him to her, had grown several inches in the time they had been away. He had changed, was so grown-up, looked so much the little man. Treena had cut off her hair and looked oddly sophisticated. She was wearing a jacket I hadn’t seen before, and strappy sandals. I found myself wondering, meanly, where she had found the money.

‘So how is it?’ I asked, while Mum walked Thomas around the garden, showing him the frogs in the tiny pond. Dad was watching football with Granddad, exclaiming in mild frustration at another supposed missed opportunity.

‘But you like the course.’

Treena’s face broke out into a smile. ‘It’s the best. I can’t tell you, Lou, the joy of just using my brain again. I feel like there’s been this big chunk of me missing for ages … and it’s like I’ve found it again. Does that sound wanky?’

I shook my head. I was actually glad for her. I wanted to tell her about the library, and the computers, and what I had done for Will. But I thought this should probably be her moment. We sat on the foldaway chairs, under the tattered sunshade, and sipped at our mugs of tea. Her fingers, I noticed, were all the right colours.

‘She misses you,’ I said.

‘We’ll be back most weekends from now on. I just needed … Lou, it wasn’t just about settling Thomas in. I just needed a bit of time to be away from it all. I just wanted time to be a different person.’

She looked a bit like a different person. It was weird. Just a few weeks away from home could rub the familiarity right off someone. I felt like she was on the path to being someone I wasn’t quite sure of. I felt, weirdly, as if I were being left behind.

‘Mum told me your disabled bloke came to dinner.’

‘He’s not my disabled bloke. His name’s Will.’

‘Sorry. Will. So it’s going well, then, the old anti-bucket list?’

‘So-so. Some trips have been more successful than others.’ I told her about the horse racing disaster, and the unexpected triumph of the violin concert. I told her about our picnics, and she laughed when I told her about my birthday dinner.

‘Do you think … ?’ I could see her working out the best way to put it. ‘Do you think you’ll win?’

Like it was some kind of contest.