City of Scars is book 14 in the DCI Jack Logan series.
As with the previous books it can be read as a standalone but in all honesty they are better read in order as a good portion of the storyline is the characters.
The characters are brilliant and once you start to read them it is very easy to get hooked into the series.
Good plotting and pace ensures you always want to read just one more chapter.
They are also full of humour which I do love.
If you wish to start from the beginning book 1 is A Litter of Bones.
Recommended.

Click HERE to view this book on Waterstones.