Nicole arrived home from the morning shift at the coffee shop to find her belongings—what few she had—piled outside the door to her apartment. Her clothes were stacked in a heap on the front stoop. A large duffel bag with wheels stood upright on the edge...

Jeremy didn’t notice her when he boarded the subway. He was too focused on getting a seat, scanning the cars for any spaces not yet filled by commuters heading into the city. He saw a free spot on the third car and when the doors opened he headed straight...