Nancy Guthrie disappeared from an Arizona neighborhood that is dark at night, quiet and spread out

TUCSON, Ariz. — Nancy Guthrie’s upscale Arizona neighborhood is quiet and mostly dark at night, lit mainly by car headlights and homes spaced far apart. Long driveways, front gates and desert plants provide a buffer from the winding streets and curious eyes. Saguaro cacti tower above the roofline o...