Which is harder: Devising an unsolvable problem, or solving that problem?” posits Keigo Higashino in The Devotion of Suspect X. The stupendous success of the murder mystery, and of the books that came afterwards — Salvation of a Saint, Malice, Invisible Helix, The Final Curtain, among others — however, threw up a third tantalising possibility. Perhaps the hardest thing is to recognise the moral ambiguity that underpins life........

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