His sin - her guilt.
A perfect family ruined by one act of madness. A child, secondary to his mother's career, resented by his grandmother and spoilt by his grandfather, grows up with a warped sense of reality and commits an unforgivable crime. Is it his upbringing or, as his grandmother insists, down to his father's bad genes? In the final reckoning, his mother must make the right decision but can she?