LEAD:
Novelist Alissa York's new book Effigy explores life inside a Mormon marriage in the 1800's. Erastus Hammer brings home his fourth bride, much to the displeasure of her three 'sister' wives. The story also weaves in the terrible Mountain Meadows Massacre of 1857 when a group of Mormons disguised as natives killed a wagon train of settlers.

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END CUE: "...published by Random Houseof Canada.
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