|summary=Ten years ago, Kathryn Brooker killed her husband Mark. Was she a cold hearted killer or a woman who could not take her abusive husband’s treatment of her any longer? Although sentenced to prison, Mark’s death is a release for Kathryn who can start to rebuild her broken personality. However, what Kathryn had not considered was the devastating impact that her actions would have on her two children, Dominic and Lydia. ''What have I done?'' is a moving and shocking story about domestic violence and its everlasting impact on all the family.
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When Kate Gavier married Mark Brooker, she was full of optimism for their marriage and their future. However, from the first day of their marriage, her dreams were shattered as she realised that Mark was nothing more than a cruel bully. He even insisted on calling her Kathryn rather than Kate which is how she prefers to be known. There followed sixteen years of torment and torture as Mark strove to control his wife and punish her for any wrongdoings – of which there were many. To the outside world though, it looked as though Mark and Kathryn had the perfect loving marriage, mainly due to Kathryn’s resolve to spare her children, Dominic and Lydia, from knowing of and witnessing their father’s cruelty. One day though, she snapped and, for the first time in her life, fought back. Hours later, Mark was dead and Kathryn was locked up in a police cell being questioned about what happened.