The crimes in “The Caller,’’ Karin Fossum’s new Norwegian thriller, are pranks, but they’re hardly harmless. In fact, they’re so fiendishly creative they eat away at their victims long after the unsettling events, and the unraveling of their peace of mind, the shattering of their false senses of security, is the real subject of this terrific new book by one of Scandinavia’s great mystery writers.
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