For Reasons Unknown: A gripping crime debut that keeps you guessing until the last page. Michael Wood

suppose it depends on the kind of bullying.’

      ‘And what kind of bully was your brother?’

      ‘It was both physical and mental. After the broken arm incident he made sure my parents never saw the bruises. He became more inventive, sneaky.’

      ‘What did he do?’

      ‘He used to spit in my breakfast and make me eat it. He’d steal things from around the house and hide them in my room so when they were found I’d get into trouble. One time I woke up in the middle of the night to find him standing next to my bed and urinating all over me.’

      ‘Oh my God. Surely that constitutes abuse?’ Rory asked.

      ‘Well I thought so.’

      ‘Did you ever tell your parents?’

      ‘What was the point? They always took his side. I wasn’t wanted. My mother didn’t find out she was pregnant with me until it was too late to do anything about it. Even if she had known she could hardly have had an abortion. How would it look for a GP who specialized in family planning to kill her own unborn baby?’

      Matilda leaned forward. ‘Jonathan,’ she said, using his first name for the first time. ‘Do you think your brother killed your parents?’