‘Will is gone. I know that. But I just can’t leap in like you can, Sam. I feel like I’m only just getting back on my feet after a long time of … I don’t know … I was a mess.’

‘I know you were a mess. I picked up that mess.’

‘If anything, I like you too much. I like you so much that if it went wrong it would feel like that again. And I’m not sure I’m strong enough.’

‘How is that going to happen?’

‘You might go off me. You might change your mind. You’re a good-looking bloke. Some other woman might fall off a building and land on you and you might like it. You could get ill. You could get knocked off that motorbike.’

‘ETA two minutes,’ said Donna, gazing at the satnav. ‘I’m not listening, honest.’

‘You could say that about anyone. So what? So we sit there and do nothing every day in case we have an accident? Is that really how to live?’ He swerved to the left so that I had to hang on to my seat.

‘I’m still a doughnut, okay?’ I said. ‘I want to be a bun. I really do. But I’m still a doughnut.’

‘Jesus, Lou! We’re all doughnuts! You think I didn’t watch my sister being eaten by cancer and know that my heart was going to break, not just for her but for her son, every day of my life? You think I don’t know how that feels? There’s only one response, and I can tell you this because I see it every day. You live. And you throw yourself into everything and try not to think about the bruises.’

‘Oh, that’s lovely,’ said Donna, nodding.

‘I’m trying, Sam. You have no idea how far I’ve come.’

And then we were there. The sign for Kingsbury estate loomed in front of us. We drove in through a huge archway, past a car park and into a darkened courtyard, where Sam pulled up and swore softly. ‘Dammit. We were meant to drop you off.’

‘I didn’t like to interrupt,’ said Donna.

‘I’ll wait here till you get back.’ I crossed my arms.

‘There’s no point.’ Sam jumped out of the driver’s door and grabbed his pack. ‘I’m not going to jump through hoops to convince you to be with me. Oh, crap. The bloody signs are missing. He could be anywhere.’

I gazed out at the forbidding maroon-brick buildings. There were probably twenty stairwells in those blocks and none you would have wanted to walk around without the company of a large bodyguard.

Donna shrugged her way into her jacket. ‘The last time I came here – heart attack – it took four tries to find the right block, and that gate was locked. We had to find a caretaker to unlock it before we could bring in the mobile unit. By the time I made it to the right flat the patient was dead.’

‘Two gang shootings here last month.’

‘You want me to call in a police escort?’ said Donna.

‘No. No time.’

It was eerily quiet, even though it was barely eight p.m. These were estates in a part of the city where only a few years ago children might have been playing out on bikes, sneaking cigarettes and catcalling long into the evening. Now residents double-locked their doors long before dark, and windows were braced with decorative metal bars. Half the sodium lights had been shot out, and the odd remaining one flickered intermittently, as if uncertain whether it was safe to shine.

Sam and Donna, now outside the cab, were talking, their voices lowered. Donna opened the passenger door, reached in and handed me a high-visibility jacket. ‘Right. Put that on and come with us. He doesn’t feel safe leaving you here.’

‘Why couldn’t he –’

‘Oh, you two! For God’s sake! Look, I’m going to head this way, you follow him that way. Okay?’

I stared at her.

‘Sort it out afterwards.’ She strode off, her walkie-talkie buzzing in her hand.

I followed close behind Sam as we went along one length of concrete walkway, then another.

‘Savernake House,’ he muttered. ‘How the hell are we supposed to know which one is Savernake?’ The radio hissed. ‘Control, can we have some guidance? No signs on these buildings, and no idea where this patient is.’

‘Sorry,’ the voice said apologetically. ‘Our map doesn’t show individual block names.’

‘Want me to head off that way?’ I said, pointing in front of us. ‘Then we’ll have three walkways covered. I’ve got my phone with me.’ We halted in a stairwell that reeked of urine and the stale fat of old takeaway cartons. The walkways sat in shadow, only the occasional muffled burble of a television behind the windows suggesting life deep within each small flat. I had expected a distant commotion, some vibration in the air that would lead us to the injured. But this was eerily still.

‘No. Stay close, okay?’

I saw that having me there was making him nervous. I wondered whether I should just leave, but I didn’t want to find my way out by myself.

Sam stopped at the end of the walkway. He turned, shaking his head, his mouth compressed. Donna’s voice crackled across the radio: ‘Nothing this end.’ And then we heard a shout.

‘There,’ I said, following the sound. On the other side of the square, in the half-light, we saw a crouching figure, a body on the ground under the sodium lights.

‘Here we go,’ said Sam, and we started to run.