Kind of Cruel (Zailer & Waterhouse Series #7)

When Amber Hewerdine consults a hypnotherapist as a desperate last resort, she doesn't expect that anything much will change.
 
She doesn't expect it to help with her chronic insomnia.

She doesn't expect to hear herself, under hypnosis, saying words that mean nothing to her: 'Kind, cruel, kind of cruel' - words she has seen somewhere before, …