Psychlone
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Psychlone is a 1979 horror novel by Greg Bear. It is set in the present day (at the time it was written) and deals with the afterlife, which makes it similar to Bear's much later Dead Lines.
The book begins with incidents in a small town and a forest cabin where ordinary people abruptly go into homicidal rages and kill each other with any available means, and thereafter friends of the deceased and the military investigate.