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The Oxford Murders
208 pages; Penguin Books
The Premise: In this brainy thriller by an Argentine math PhD, the narrator arrives at Oxford after graduating from the University of Buenos Aires. Soon, he and a well-known logician get caught up trying to solve a series of killings, following what appear to be mathematical clues. (Although the book was big in Argentina, Spain and the UK, American readers might've missed it.)

Why the Ending Is a Stunner: Not only are the killer and the motive a surprise, but there's also an entirely unwitting accomplice.
— Dawn Raffel