How I love this series, yes, the book can be read as a stand-alone, but why would you? I think the previous books give the character development and explain the relationships of Washington Poe, Tilly Bradshaw, Stephanie Flynn, and Estelle Doyle, Poes few (and only friends). It's hard to describe the plot without giving spoilers, but Poes' investigation leads him to a religious cult when a man is found stoned to death. The book is very dark, so read the triggers before embarking on this twisty, fast ride of a book. Tilly and her naivety provide light relief. Poe and Tilly are joined in their investigation by Linus, quickly renamed Snoopy by Poe. The book starts with Poe seeing a therapist for PTSD as he is not sleeping as he stays awake to avoid seeing a murder of crows. A thrilling, dark, twisty, extraordinary, innovative superb book. I can't wait to read the next in the series, but unfortunately, it is not out until next year. I am bereft and is counting down the days for my next Poe and Tilly fix as there is much to be sorted out from the end of the book. I love it so, wonderful writing with wonderful characters including Tilly, my favourite geek and Pie my favourite rougue police sargent. Pure brilliance.