At first glance there's nothing unusual about this neighborhood in the Ukrainian city of Lviv. Quiet, narrow streets are lined with perfectly regular houses for the area. In districts like this, neighbors don't often keep secrets from each other. But one family was hiding something sinister — for 15 years. People on the street knew the Kuchumoys and had only good things to say about the couple. That is, until their inconceivably dark actions came to light.