But Strike had aspired to this career long before the last needle had entered Leda’s body; long before he had understood that his mother (and every other human) was mortal, and that killings were more than puzzles to be solved. It was Lucy who never forgot, who lived in a swarm of memories like coffin flies; who projected on to any and all unnatural deaths the conflicting emotions aroused in her by their mother’s untimely demise.

Tonight, however, he found himself doing the very thing that Lucy was sure must be habitual: he was remembering Leda and connecting her to this case. Leda Strike, supergroupie. It was how they always captioned her in the most famous photograph of all, and the only one that featured his parents together. There she was, in black and white, with her heart-shaped face, her shining dark hair and her marmoset eyes; and there, separated from each other by an art dealer, an aristocratic playboy (one since dead by his own hand, the other of AIDS) and Carla Astolfi, his father’s second wife, was Jonny Rokeby himself, androgynous and wild: hair nearly as long as Leda’s. Martini glasses and cigarettes, smoke curling out of the model’s mouth, but his mother more stylish than any of them.

Everyone but Strike had seemed to view Leda’s death as the deplorable but unsurprising result of a life lived perilously, beyond societal norms. Even those who had known her best and longest were satisfied that she herself had administered the overdose they found in her body. His mother, by almost unanimous consent, had walked too close to the unsavoury edges of life, and it was only to be expected that she would one day topple out of sight and fall to her death, stiff and cold, on a filthy-sheeted bed.

Why she had done it, nobody could quite explain, not even Uncle Ted (silent and shattered, leaning against the kitchen sink) or Aunt Joan (red-eyed but angry at her little kitchen table, with her arms around nineteen-year-old Lucy, who was sobbing into Joan’s shoulder). An overdose had simply seemed consistent with the trend of Leda’s life; with the squats and the musicians and the wild parties; with the squalor of her final relationship and home; with the constant presence of drugs in her vicinity; with her reckless quest for thrills and highs. Strike alone had asked whether anyone had known his mother had taken to shooting up; he alone had seen a distinction between her predilection for cannabis and a sudden liking for heroin; he alone had unanswered questions and saw suspicious circumstances. But he had been a student of twenty, and nobody had listened.