Four in the morning on Buell Lane, and the village is nothing but streetlight and falling white. ARK Construction Co. Inc. runs its plow routes through those hours, when East Hampton is still asleep behind its shutters and the shingle roofs are going soft at the edges. Snow on the South Fork blows in off the water heavy and wet, the kind that packs down hard by sunrise if nobody moves it first. So the drives get opened early, the walks cut down to the pavement, salt laid at the foot of the steps where ice likes to hide. By the time the light finds the arms of Hook Mill, the way out is already there.