Gillard could hardly imagine the horror of Dr Chen’s final minutes. ‘And after everything, you had Gary dump him in the Thames.’

She shrugged, a mountainous tremor beneath the nightdress. ‘Who would know?’

‘When did you dream up this idea of revenge against Rollason?’

‘The moment the Hyacinth Trust was notified of his release. I was totally disgusted that it could be allowed, but then I realised Verity would be a great asset. She was reluctant at first, of course. Too professional.’

‘And where is she?’

‘Gone off to Nottingham.’

Gillard had heard enough. ‘Mrs Tilling, investigations are continuing. You are likely to be charged with murder. And you’ll be going to hospital, to get you in shape for a visit to court. They’ll look after you better than Gary can.’

‘I won’t go.’

‘You will. In fact, if you’d had appropriate treatment at the start, proper therapy, exercise and mental health assistance after Robert first disappeared, this festering fantasy of vengeance would never have been necessary.’

‘You have no idea.’

‘Social services will be here soon.’