If you loved how the Mystery Club—nicknamed members like “Agatha,” “Ellery,” and “Carr”—are stranded in the decagonal house as the group dynamic fractures, Christie’s classic will hit the same nerve. Ten strangers, each with secrets, are summoned to an island and picked off one by one, and—much like the mounting dread in The Decagon House Murders—you’ll relish tracking alliances, suspicions, and recriminations as the ensemble turns on itself.

You enjoyed the razor-contained setup of the decagonal house on Tsunojima—one setting, finite suspects, fair-play clues. Yokomizo delivers a quintessential locked-room puzzle: a newlywed couple slain inside a room sealed from within. Like poring over the floor plans and alibis in The Decagon House Murders, you’ll get that same contained, methodical thrill as every physical detail becomes a potential key to the solution.

If the alternating strands between the island killings and the mainland sleuthing by Shimada and Kawaminami hooked you, Onda’s mosaic of testimonies, interviews, and recollections will be catnip. As with the anonymous accusations and past-campus scandal echoing through The Decagon House Murders, each new perspective subtly rewrites what you think you know—until the final pieces click into place.

You appreciated how the island narrative seeds fair clues before pulling the rug—especially once the truth behind those ominous letters and nicknames surfaces. Higashino crafts a masterclass in misdirection: you see the crime, you follow the investigation, and then a late-game revelation reframes everything. That same “oh—so that’s what I missed” jolt you felt in The Decagon House Murders lands here in spades.

If deciphering the puzzle in the decagonal house—tracking alibis, layouts, and the mainland leads—was your favorite part, Shimada’s cerebral mystery is a feast. The novel presents documents, diagrams, and a decades-cold case that, like the mainland thread in The Decagon House Murders, challenges you to solve it alongside the detectives. It’s a pure, satisfying payoff for readers who love to outthink the plot.