CNN Anderson Cooper 360 April 12, 2013 05:45:00
Here's a preview. >> reporter: on august 22nd, 2001, two weeks before the horrors of 9/11, michael shannon sent his two sons off to new york with their mother, for what he thought would be a weekend visit. it would be the last time he saw either one of them. >> they were out of the country before we even knew they were gone. >> reporter: on sunday night, august 26th, when his sons were not back, he drove to his ex-wife's apartment and his life suddenly changed. what was that day like when you pulled up? >> i went to the apartment to pick them up. it was like it was ransacked. i went to the pro...