In the interest of full disclosure, I reviewed an Advanced Readers Copy of the book, in exchange for a fair and honest review. I have read, reviewed, and ultimately purchased the three prior books in this series, and just purchased this book in paperback.
This is the fourth book in the series, featuring the primary character Gavin, an assassin turned protector of a city troubled by outside magical threats. This book features further development of some of Gavin's associates as well as the nature of the threats posed to Gavin and the city by his former teacher and master manipulator, Tristan. This is the first book in which the author takes Gavin outside of the city and the comfort of his associates, during which he is forced to work collectively within a team he has developed, although it is against the nature of his training. Holmberg introduces two characters he has developed in another series, which make more than a passing cameo in this book, serving to establish an effective tie-in between the two series.
While describing a series of conflicts and fights, Holmberg is not salacious in the depiction of the violence. While there are references to interpersonal romantic relationships, there was no content of a sexual nature that I recall. This book did not contain any content which I would be worried about serving as a trigger to strong reader emotion, such as sexual or domestic violence or sexually discriminating language. Holmberg presents another great continuation to his storyline, with a good end point chosen, in which he offers a completed plot line, with hooks set for the next story in the series.
I look forward to your next book, Mr. Holmberg. I love both this series (Chain Breaker) and your Executioner series and recommend both to potential readers!