I #AmReading The Last Murder at the End of the World by Stuart Turton.
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Outside the island there is nothing: the world destroyed by a fog that swept the planet, killing anyone it touched.
On the island: it is idyllic. 122 villagers and 3 scientists, living in peaceful harmony. The villagers are content to fish, farm and feast, to obey their nightly curfew, to do what they're told by the scientists. Until one of their beloved scientists is found brutally stabbed to death.