His state of mind was not entirely propitious, therefore, when he headed off to Mayfair at eight o’clock that evening, wearing his best Italian suit, thoughts of a serial killer still chasing each other around his overtired brain.

Upper Brook Street comprised grand eighteenth-century houses and the frontage of Le Gavroche, with its wrought iron canopy and ivy-covered railings, the expensive solidity and security implied by its heavy mirrored front door, was dissonant to Strike’s uneasy frame of mind. Elin arrived shortly after he had been seated in the green and red dining room, which was artfully lit so that puddles of light fell only where needed onto snow-white tablecloths, over gilt-framed oil paintings. She looked stunning in a pale blue form-fitting dress. As he rose to kiss her, Strike momentarily forgot his latent unease, his disgruntlement.

“This makes a nice change,” she said, smiling, as she sank down onto the curved, upholstered bench at their round table.

They ordered. Strike, who craved a pint of Doom Bar, drank burgundy of Elin’s choosing and wished, despite having smoked more than a pack that day, that he could have a cigarette. Meanwhile, his dinner companion launched into a barrage of property talk: she had decided against the Strata penthouse and had now looked at a property in Camberwell, which seemed promising. She showed him a picture on her phone: another columned and porticoed vision of Georgian whiteness met his tired eyes.

As Elin discussed the various pros and cons of a move to Camberwell, Strike drank in silence. He even begrudged the wine’s deliciousness, throwing it back like the cheapest plonk, trying to blunt the edges of his resentment with alcohol. It did not work: far from dissolving, his sense of alienation deepened. The comfortable Mayfair restaurant with its low lighting and its deep carpet felt like a stage set: illusory, ephemeral. What was he doing here, with this gorgeous but dull woman? Why was he pretending to be interested in her expensive lifestyle, when his business was in its death throes and he alone in London knew the identity of the Shacklewell Ripper?

Their food arrived and the deliciousness of his fillet of beef did something to assuage his resentment.

“So what have you been up to?” asked Elin, punctiliously polite as usual.

Strike now found himself presented with a stark choice. Telling her the truth about what he had been up to would necessitate an admission that he had not kept her abreast of any of the recent events that would have been deemed enough news for a decade in most people’s lives. He would be forced to reveal that the girl in the newspapers who had survived the Ripper’s latest attack was his own business partner. He would have to tell her that he had been warned off the case by a man whom he had previously humiliated over another high-profile murder. If he were making a clean breast of all that he had been up to, he ought also to add that he now knew exactly who the killer was. The prospect of relating all this bored and oppressed him. He had not once thought to call her while any of these events had unfolded, which was revealing enough in itself.