He could find no Facebook page for Landry, nor did she ever seem to have joined Twitter. Her refusal to feed her fans’ ravenous appetite for personal information seemed to have inspired others to fill the void. There were countless websites dedicated to the reproduction of her pictures, and to obsessive commentary on her life. If half of the information here was factual, Bristow had given Strike but a partial and sanitised version of his sister’s drive towards self-destruction, a tendency which seemed to have revealed itself first in early adolescence, when her adoptive father, Sir Alec Bristow, a genial-looking bearded man who had founded his own electronics company, Albris, had dropped dead of a heart attack. Lula had subsequently run away from two schools, and been expelled from a third, all of them expensive private establishments. She had slit her own wrist and been found in a pool of blood by a dormitory friend; she had lived rough, and been tracked to a squat by the police. A fan site called LulaMyInspirationForeva.com, run by a person of unknown sex, asserted that the model had briefly supported herself, during this time, as a prostitute.

Then had come sectioning under the Mental Health Act, the secure ward for young people with severe illnesses, and a diagnosis of bipolar disorder. Barely a year later, while shopping in a clothing store on Oxford Street with her mother, there had come the fairy-tale approach from a scout for a modelling agency.

Landry’s early photographs showed a sixteen-year-old with the face of Nefertiti, who managed to project to the lens an extraordinary combination of worldliness and vulnerability, with long thin legs like a giraffe’s and a jagged scar running down the inside of her left arm that fashion editors seemed to have found an interesting adjunct to her spectacular face, for it was sometimes given prominence in photographs. Lula’s extreme beauty was on the very edge of absurdity, and the charm for which she was celebrated (in both newspaper obituaries and hysterical blogs) sat alongside a reputation for sudden outbursts of temper and a dangerously short fuse. Press and public seemed to have both loved her, and loved loathing her. One female journalist found her ‘strangely sweet, possessed of an unexpected naiveté’; another, ‘at bottom, a calculating little diva, shrewd and tough’.

At nine o’clock Strike walked to Chinatown and bought himself a meal; then he returned to the office, swapped Tom Waits for Elbow, and searched out online accounts of Evan Duffield, the man who, by common consent, even that of Bristow, had not killed his girlfriend.

Until Kieran Kolovas-Jones had displayed professional jealousy, Strike could not have said why Duffield was famous. He now discovered that Duffield had been elevated from obscurity by his participation in a critically acclaimed independent film, in which he had played a character indistinguishable from himself: a heroin-addicted musician stealing to support his habit.

Duffield’s band had released a well-reviewed album on the back of their lead singer’s new-found fame, and split up in considerable acrimony around the time that he had met Lula. Like his girlfriend, Duffield was extraordinarily photogenic, even in the unretouched long-lens photographs of him sloping along a street in filthy clothes, even in those shots (and there were several) where he was lunging in fury at photographers. The conjunction of these two damaged and beautiful people seemed to have supercharged the fascination with both; each reflecting more interest on to the other, which rebounded on themselves; it was a kind of perpetual motion.