Kind of Cruel by Sophie Hannah

This is the first Sophie Hannah book I have read and it won't be the last.  Amber Hewerdine is suffering from insomnia and goes to see a hypnotherapist not expecting it to help.  She is obsessed by an event that happened several years earlier when her sister-in-law, Jo, rented a large house, Little Orchard, for the whole extended family to stay one Christmas.  While there, Jo, her husband and their two sons went missing for 24 hours on Christmas day.  They returned unharmed, but no mention was made of it again.  While under hypnosis Amber utters the words ‘kind, cruel, kind of cruel’ – these words mean nothing to her, but as the story unfolds she realises she has seen the words before.  She thinks she must have seen them at Little Orchard.  She is arrested two hours later as a result of having said the words.  The words are somehow connected with the murder of woman Amber has never met or heard of.  I liked the intrigue from the start.  The story is mostly narrated by Amber, but there are also chapters narrated by the hypnotherapist.  I was a little disappointed by the end.