It was the start of October and the dog days of summer in the nation’s capital had officially come to an end. The crisp autumn air, a relief to most Washingtonians in years past, was an ominous foreshadowing of the days and weeks to come. There would be no more open windows in homes, streetcars, or workplaces for the foreseeable future. With an invisible killer hanging in the air, Washington would soon find itself in crisis — and transplanted war workers bore the brunt of it.