An ice storm turns Booth Hill into something out of glass, every twig sheathed and the road holding a dull shine long past sunrise. Hennessey Tree & Landscape LLC works the snow and ice end of Shelton's winter — plowing driveways, opening walks and steps, clearing what the storm packs against the garage door, and treating the surfaces that stay slick in shade. On hills like these the difference between passable and impossible is a matter of inches and a little sand. Getting there before the household stirs is the whole ambition of the night. Shelton climbs steeply away from the river, and winter here rewards the crews who plan for the grade.