It was a warm June afternoon when Judith Plaskow got the email reminding her of a guest arriving soon. The woman staying at Plaskow's Washington Heights apartment was a stranger who needed to be picked up at the Port Authority bus terminal on Manhattan's West Side. She was young — just 19 — and had never been to New York City before. Plaskow guessed she'd be scared. The woman wasn't coming to the big city for thrills or fun. There'd be no Broadway show, no visit to the Empire State building. She was making a 10-hour trip to receive safe,...