The Betrayal of Trust by Susan Hill is the sixth book in the DCI Simon Serrailler Series. As always, Susan Hill offers a mix of police procedural and social commentary. This time, crime very much takes a back seat as social and moral issues are explored. The Betrayal of Trust is the series darkest and most enthralling of novel so far. Author Susan Hill sheds light on many dark and often unspoken issues. Aging, assisted suicide, euthanasia, and living with a terminal illness are all examined closely. Virtually all of the well rounded characters are dealing with death and grieving in one way or another. Simon's sister, physician Cat Deerborn, is still grieving the loss of her husband to cancer. One of her patients, Jocelyn Forbes, is stricken with Motor Neuron Disease, also known as ALS, and is trying to come to terms with this. The town of Lafferton, where all of the action takes place , is struggling to fund a hospice, and yet another person agonizes over care homes for her partner, now stricken with dementia. If this book sounds dark, it is. However, as many of us have struggled with aging parents, terminal illness, palliative care as well as relatives who have wish for assisted suicide, I suspect that this novel will resonate with many of us. I found the situations dealt with to be stark and true to life , and I congratulate Susan Hill on her ability to tackle dark and challenging issues without sentimentality but with realism and compassion. This novel was a powerful, dark and illuminating read. It will stay with me for a long time. 4.5 stars.