Behind the concrete and clanging steel of downtown Los Angeles, there is a version of Nick Reiner's life that looks nothing like the one he once knew. Since his arrest in December in connection with the deaths of his parents, Rob Reiner and Michele Singer Reiner, Nick's world has been reduced to a 7-by-10-foot cell inside LA's Twin Towers Correctional Facility. It's a stark, quiet existence, heavy with routine and surveillance, and defined by isolation.