The morning my husband left for what he described, with casual confidence, as a three-day logistics conference in Denver began like so many other mornings in our home outside Raleigh, North Carolina, with the scent of dark roast coffee rising through the kitchen and the faint citrus of countertop spray lingering in the air because I had wiped everything down after breakfast in an attempt to quiet the restlessness that had been living in my chest for months.