The grainy little video, three inches by four, jerked into life. A large black man wearing some kind of hooded top with a fist picked out in studs on the chest sat in a black leather chair, facing an unseen interviewer. His hair was closely shaven and he wore sunglasses.

‘… Lula Landry’s suicide?’ said the interviewer, who was English.

‘That was fucked-up, man, that was fucked-up,’ replied Deeby, running his hand over his smooth head. His voice was soft, deep and hoarse, with the very faintest trace of a lisp. ‘That’s what they do to success: they hunt you down, they tear you down. That’s what envy does, my friend. The motherfuckin’ press chased her out that window. Let her rest in peace, I say. She’s getting peace right now.’

‘Pretty shocking welcome to London for you,’ said the interviewer, ‘with her, y’know, like, falling past your window?’

Deeby Macc did not answer at once. He sat very still, staring at the interviewer through his opaque lenses. Then he said:

‘I wasn’t there, or you got someone who says I was?’

The interviewer’s yelp of nervous, hastily stifled laughter jarred.

‘God, no, not at all – not…’

Deeby turned his head and addressed someone standing off-camera.

‘Think I oughta’ve brought my lawyers?’

The interviewer brayed with sycophantic laughter. Deeby looked back at him, still unsmiling.

‘Deeby Macc,’ said the breathless interviewer, ‘thank you very much for your time.’

An outstretched white hand slid forwards on to the screen; Deeby raised his own in a fist. The white hand reconstituted itself, and they bumped knuckles. Somebody off-screen laughed derisively. The video ended.

‘“The motherfuckin’ press chased her out that window”,’ Strike repeated, rolling his chair back to its original position. ‘Interesting point of view.’

He felt his mobile phone vibrate in his trouser pocket, and drew it out. The sight of Charlotte’s name attached to a new text caused a surge of adrenalin through his body, as though he had just sighted a crouching beast of prey.

I will be out on Friday morning between 9 and 12 if you want to collect your things.

‘What?’ He had the impression that Robin had just spoken.

‘I said, there’s a horrible piece here about her birth mother.’

‘OK. Read it out.’

He slid his mobile back into his pocket. As he bent his large head again over Mrs Hook’s file, his thoughts seemed to reverberate as though a gong had been struck inside his skull.

Charlotte was behaving with sinister reasonableness; feigning adult calm. She had taken their endlessly elaborate duel to a new level, never before reached or tested: ‘Now let’s do it like grown-ups.’ Perhaps a knife would plunge between his shoulder blades as he walked through the front door of her flat; perhaps he would walk into the bedroom to discover her corpse, wrists slit, lying in a puddle of congealing blood in front of the fireplace.

Robin’s voice was like the background drone of a vacuum cleaner. With an effort, he refocused his attention.