Evergreen book review · Updated October 8, 2026
The Decagon House Murders by Yukito Ayatsuji is a strong choice for readers who enjoy an isolated setting, a limited group of suspects and a mystery built around deduction. I enjoyed its twists and the way its two strands come together. This review discusses the setup and reading experience without revealing the solution.
What is The Decagon House Murders about?
Seven university mystery-club members travel to an island off Japan’s coast. Its connection to earlier unsolved deaths makes it especially interesting to a group that loves detective fiction. Their stay becomes far more dangerous when they are confronted with a threat aimed at the visitors themselves.
On the mainland, former club member Kawaminami receives an unsettling letter about the death of another member. His investigation runs alongside events on the island. The relationship between these two lines of inquiry is part of the pleasure of the book, so it is best discovered while reading.
The English translation is by Ho-Ling Wong. Pushkin Press’s book page confirms the translator credit. Ayatsuji’s novel was originally published in Japan in 1987 and helped establish the modern revival of traditional puzzle mysteries.
What worked for me
The book’s connection to Agatha Christie’s And Then There Were None is easy to recognize in its isolated group and mounting suspicion. What made it enjoyable for me was watching Ayatsuji shape his own puzzle around that familiar starting point. The appeal is the construction of the mystery, rather than simply waiting for another death.
I enjoyed the twists and turns, especially how the island and mainland stories eventually meet. Reading Christie gave me a useful instinct for suspects, and I had a theory about the killer. Even so, the major revelation surprised me. Guessing part of the answer did not take away the payoff.
Who should read it?
Read it if you like testing theories, keeping track of a small group and reconsidering clues when new information arrives. The architecture of the puzzle is the main attraction. Readers looking for a deeply intimate character study may find that the mystery machinery receives more attention than the individual lives of every suspect.
The setup involves murder and threats of violence, so this is not a comforting mystery simply because it is carefully plotted. It is, however, a good starting point if you want to explore Japanese detective fiction through a relatively focused case.
Where it fits in the House books
Start with The Decagon House Murders, then try The Mill House Murders. These are different cases rather than two halves of one unfinished story. Publication order provides a straightforward introduction to Ayatsuji’s approach.
For more background, the publisher’s author page introduces his work. You do not need to read every Christie novel before beginning, though fans of classic whodunits will recognize the tradition he is working in.
My verdict
I recommend The Decagon House Murders to readers who enjoy a mystery they can actively try to solve. Its parallel investigations and final reveal made it more than a familiar island setup for me. Go in knowing the premise, then let the book control the rest of the information.
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