I won't put a star rating as i don't really want to make J.K.'s book look good. But a compelling if somewhat slow read.

pros:
- the cult setting was extremely well done, very frightening and sinister and the traumatic effect on Robin and the others was obvious in their reactions. It definitely made you think about the horrors of cults.
- sadly J.K. is a talented writer and the pacing and characters are very good, with the complicated plot coming together and the characters growing throughout, to a degree.

cons 
- the plot did feel too complicated towards the end as I struggled to keep straight who certain people were, including Graves and Abigail and some others. Would probably reward a reread.
- Strike was a bit annoying in this book, as he seemed naive/careless about the torment Robin went through (which though well addressed as it was happening and immediately after, seemed to be forgotten as the plot came together at the end), his jealousy towards Murphy is tiring, and his lack of action towards Robin gets frustrating.
- J.K. is clearly also making a point about how the law hesitates to go against people for PC reasons and overly tip toeing around sensitive issues, like religious freedom and people living differently. Strike snidely says 'live and let live' to criticise the cult. I think she is doing a subtle dig here towards trans people and their rights.

but overall another compelling Robin and Strike novel, probably the one that gripped me most so far with the scary cult plot.