Call her Sheila. She doesn’t want her name used because of court testimony she has given as a state social worker which helped put men who abused their families in jail. She’s retired now, but still a rescuer by nature. On a recent afternoon she went back to Madonna Manor, the Catholic orphanage in a Spanish colonial revival building, now shuttered, several miles across the Mississippi River from New Orleans. “A reverent place,” she sighed, “but it’s also a crime scene.” She gazed at the wooden plank covering a window. Raccoons now nested in rooms that were once the dormitory...