MIAMI — Juan was arrested today, Susana Matta wrote in her journal, shifting in her seat as though uncomfortable with sitting still. This is my worst nightmare and my most joyful dream clashing...

Susana Matta has always been good at keeping secrets.  Since she was 6 years old, her parents told her the slightest slip of the tongue could lead to the end of their livelihood. So, she kept quiet. Her...