Even if it's an entertaining and gripping story it's not the best in this series. The mystery part works fine and it's solid, I had some doubts about the part regarding Joanna's personal life.
The characters are fleshed out, the mystery is solid and gripping.
It can be read as a standalone but it's better to read the rest of the series.
Recommended.
Many thanks to the publisher and Netgalley for this ARC, all opinions are mine