NICK SCHIFRIN:

Today, Lopez is the deportees' only source of help. He hands Gonzales a little spending cash and leads him outside the airport. Gonzales carries only what U.S. immigration allowed him to take: a mesh bag, the clothes on his back.

They lead him into Mexico City's sprawling metro system. Gonzales is almost immediately lost. He gets off the metro. He hopes it's the right stop. He looks for a bus to take him an hour out of town to his ex-wife's House, but he hasn't talked to her in four years.

He decides that she's a long shot, and there is only one remaining sanctuary.