To investigate the killings further , Cross travels to the Suburban owner 's small hometown in Vermont .
To investigate the killings further , Cross discovers that after her children were killed , she was institutionalized at a state mental hospital from which she later escaped .
To investigate the killings further , Cross travels to the Suburban owner 's small hometown in Vermont and discovers that after her children were killed , she was institutionalized at a state mental hospital from which she later escaped .