It was she who had called Strike. Hours had passed since she had received a text saying that he had been compelled to go with the police to Scotland Yard, and asking her to lock up the office behind her at five. Robin had been worried.

‘Call him, then, if it’s going to keep you awake,’ Matthew had said; not quite snapping, not quite indicating that he was, without knowing any of the details, firmly on the side of the police.

‘Listen, I want you to do something for me,’ said Strike. ‘Call John Bristow first thing tomorrow and tell him about Rochelle.’

‘All right,’ said Robin, with her eyes on the large stuffed elephant Matthew had given her on their first Valentine’s Day together, eight years previously. The present-giver himself was watching Newsnight in the sitting room. ‘What are you going to be doing?’

‘I’m going to be on my way to Pinewood Studios for a few words with Freddie Bestigui.’

‘How?’ said Robin. ‘They won’t let you near him.’

‘Yeah, they will,’ said Strike.

After Robin had hung up, Strike sat motionless for a while in his dark office. The thought of the semi-digested McDonald’s meal lying inside Rochelle’s bloated corpse had not prevented him consuming two Big Macs, a large box of fries and a McFlurry on the way back from Scotland Yard. Gassy noises from his stomach were now mingling with the muffled thuds of the bass from the 12 Bar Café, which Strike barely noticed these days; the sound might have been his own pulse.

Ciara Porter’s messy, girlish flat, her wide, groaning mouth, the long white legs wrapped tightly around his back, belonged to a life lived long ago. All his thoughts, now, were for squat and graceless Rochelle Onifade. He remembered her talking fast into her phone, not five minutes after she had left him, dressed in exactly the same clothes she had been wearing when they pulled her out of the river.

He was sure he knew what had happened. Rochelle had called the killer to say that she had just lunched with a private detective; a meeting had been arranged over her glittering pink phone; that night, after a meal or a drink, they had sauntered through the dark towards the river. He thought of Hammersmith Bridge, sage green and gold, in the area where she claimed to have a new flat: a famous suicide spot, with its low sides, and the fast-flowing Thames below. She could not swim. Night-time: two lovers play-fighting, a car sweeps by, a scream and a splash. Would anyone have seen?

Not if the killer had iron-clad nerves and a liberal dash of luck; and this was a murderer who had already demonstrated plenty of the former, and an unnerving, reckless reliance on the latter. Defending counsel would undoubtedly argue diminished responsibility, because of the vainglorious overreaching that made Strike’s quarry unique in his experience; and perhaps, he thought, there was some pathology there, some categorisable madness, but he was not much interested in the psychology. Like John Bristow, he wanted justice.