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For the Hess family, Seabrook, N.H., was a new start, a place to put the past behind them. But for years, the mother’s alcohol abuse wreaked havoc on the household, leaving a void of structure and stability. For Darriean, the baby of the family, the chaos of her childhood set her on a wayward course, one that would take her to Alaska and back again, and finally, in a fateful moment, to the span over the Hampton River on a fall day.