Another perfectly capable Rivers of London book and overall a good read in an off itself. It's probably just as good as the rest of the series, though my enjoyment has lessened somewhat as the series has gone on. Its a fun, quick read, perhaps a little too safe with its characters but that's unlikely to be something that changes after nine main books plus countless graphic novels and short stories 

The central mystery plot is pretty good, although a few aspects could definitely be picked at and the slightly hamfisted info dump chapter was a bit of a let down. 

It's hard to have too much to say about it, the characters are good and are used pretty well even if a few too many are packed in, there's the usual Peter or someone stood next to Peter knows something incredibly specific and useful at the right time issue but the series has settled down into what it likely always was going to be; a procedural that provides a decent case each iteration and makes incremental changes through time that will keep chugging on and on.

They're good reads but the days of them being potentially great are probably gone, and as per usual Nightingale is underused.