The Devotion of Suspect X in 10 Minutes: A Love as Precise and as Terrifying as a Proof

Enter the Detective, Old Classmates Reunite

Kusanagi of the Metropolitan Police takes the Togashi missing-person case, and suspicion quickly settles on Yasuko. As always, he turns to his college classmate Yukawa, the physicist nicknamed Galileo, for help — the standard move for this old pair. Yukawa barely has to look before he realizes that the quiet math teacher living next door to Yasuko is the very man he admired most back in college. The two old classmates find themselves reunited over Yasuko's case, one working to solve it, one working in secret to protect her, and the smartest duel in the whole book unfolds from here — the mutual respect is real, and so is the mutual probing.

A Body Turns Up on the Riverbank, Identified as Togashi

The case seems to turn a corner. A man's body is found by the river, its face destroyed, its fingerprints erased, and the circumstantial evidence points naturally to Togashi — the time of death fits, the build fits, and Yasuko walks away with an alibi that looks nearly airtight. The police relax, and so does the reader: the case is about to close. I believed it too, the first time through — right up until Higashino, without any hurry, starts knocking down every one of those fits, one by one.

The most ruthless thing about the author's pacing here is that he refuses to rush the reveal. The identification of the body on the riverbank drags on for a whole stretch, long enough that the reader slides into the same tidy explanation Kusanagi has, before Yukawa starts pulling the thread from the outside in. That is the inverted mystery's real trick: hand you a perfectly finished lie, then make you watch it come apart in real time.

Yukawa Closes In on the Edge of the Truth

Yukawa doesn't work the way ordinary detectives do, piecing together footprints and alibis. He is watching Ishigami's mind instead, asking himself what kind of intelligence could improvise a cover-up of this precision in a single night. The two of them keep crossing paths, in Yasuko's stairwell, in a shop near the university, sentences trailing off unfinished, neither man willing to say the thing out loud. Higashino isn't writing a chase here; he's writing restraint between two brilliant men. The smarter you are, the less you want to be the one who tears that last layer of paper, because tearing it means someone bleeds.

The Real Cost of Devotion

Yukawa finally forces his way to the core of it: the body on the riverbank identified as Togashi was never Togashi at all. It was a homeless man who lived by the river, killed by Ishigami that same night — a man with no connection to the case whatsoever, chosen only because he happened to be there, only because Ishigami needed a face that could not be identified right away to splice the timeline together. A mathematician, solving for one unknown, reached out and used an unrelated human being as raw material. This is the coldest cut in the whole book: you think he is protecting the weak, and all the while he is grinding down someone even weaker.

The way Higashino delivers this cut is worth noticing. He gives Ishigami no guilt, and he gives the reader no sentimental grief for the man who died. He has Yukawa lay out the facts one at a time, in the flattest possible physicist's voice, all the emotion pressed down into numbers and cause and effect, which is exactly how Ishigami himself sees it. A man who treats murder as an equation to solve: that is what makes the reader's skin crawl here, because he isn't a villain. He is simply loving someone the only way he knows how.

The Confession, and That One Scream

Once the truth surfaces, Yasuko does not stay silent. She walks into the police station and tells them everything: her daughter's part in it, Ishigami's cover-up, her own accidental killing of Togashi. Higashino gives her reason with a restraint that cuts deep: she cannot carry the weight of an innocent life lost because of her. With that, she dismantles with her own hands the entire structure Ishigami built to protect her that night. The ending is the scene Higashino's readers keep coming back to: Ishigami lets out a scream torn straight from his chest, the one true collapse, in the whole book, of a genius who has spent his life suppressing everything he feels.

I have to say this: most adaptations fail exactly here, because if that scream reads as anger, the scene collapses. Ishigami's breakdown is not anger. It is watching an equation he spent half his life solving get torn up, principal and interest both, by the one person it was for — he handed over a stranger's life, and what came back was her refusal to even accept the gift. That is the most painful place in the whole book.

What This Book Is Really About, and Why It Still Matters Now

This book puts who did it on the table from the first page. What it actually asks is how far one person is willing to carry another person's guilt as his own.

You Already Know What Happens. Here's Why You Should Still Read It.